Numbers /91
How rare is 91?
91 scores 816 and sits in the Singular tier — 1 in 6,024 of all supported numbers score this high or higher. Everything below is computed from a complete analysis of all 1,000,001 numbers in range.
RNGdle.net’s own rarity score. Top 0.02% means that proportion of supported numbers scores at least this high. Every exact number has the same chance of being rolled. Same-length rank keeps the score and compares only numbers with 2 digits, including ties. How this differs from EP · Badge guide
These notes make the number easy to read, but they add no score unless a separately counted rarity signal appears below.
One of only 90 two-digit numbers in range.
Range · signal frequency
A sum 1 + 2 + … + k for some k.
Factorization · signal frequency
This number's digits add up to an uncommon total.
Arithmetic · signal frequency
This number uses an uncommon count of distinct digits.
Repetition · signal frequency
Iterating the sum of squared digits reaches 1.
Arithmetic · signal frequency
The product of exactly two primes.
Factorization · signal frequency
Strongest signal: Two-digit number. It appears in 90 supported numbers and contributes +269 after correlation decay.
Why is 91 unusual? Only 0.02% of the 1,000,001 supported numbers receive an equal or higher rarity score. This number falls in the Singular tier. Scoring is grounded in the exact frequency of each detected trait — rarer traits carry more information and contribute more to the score.
Algorithm version 1.1.0
One digit away
One digit, +467 points.
Your number
91
Singular · Top 0.02%
Position 1: 9 → 2 · +467 points.
Gained: Fibonacci number, Digit sum 3, Binary palindrome, Harshad number.
17 legal neighbours · same digit length · no leading zeros. This describes an alternative number, not the odds of your next roll.
Explore & share this near miss →Similar interesting numbers
Explore a shared pattern, a comparable score, or a mathematical relationship. Every link explains its connection to 91.
Shared patterns
Same length, nearby scores
Mathematical relationships
Patterns in this number
Each of these has its own page explaining how common the pattern is and why.
Happy Numbers
Square each digit, add them up, repeat. If you eventually reach 1 the number is happy; if not, you fall into a cycle. 19 → 82 → 68 → 100 → 1.
Semiprime Numbers
A semiprime is a product of exactly two primes, counted with multiplicity — 15 = 3 × 5, and 49 = 7 × 7 counts too.
Triangular Numbers
A triangular number counts the dots in a triangle: 1, 3, 6, 10, 15, 21 — each one the running total 1 + 2 + … + k.