Properties of the Number 91023

Ninety-One Thousand Twenty-Three

Basics

Value: 91022 → 91023 → 91024

Parity: odd

Prime: No

Previous Prime: 91019

Next Prime: 91033

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 30341

Divisors: 1, 3, 30341, 91023

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10110001110001111

Octal: 261617

Duodecimal: 44813

Hexadecimal: 1638f

Square: 8285186529

Square Root: 301.7001823002432

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two sums of the central column and central row nondecreasing horizontally and vertically. A258522

Triangle read by rows: T(n,k) is the number of deco polyominoes of height n and having k columns ending at an even level (1<=k<=n). A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column. A121698

Numerators of continued fraction convergents to sqrt(640). A42228

Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two sums of the central column and central row nondecreasing horizontally and vertically. A258520

Number of permutations of decimal digits of 2ⁿ which yield a prime. A86151

a(1)=1; for n >= 2, set a(n)=m, where n is the smallest unassigned index with exactly m-1 unassigned indices still remaining between m and m-1. A91023