Properties of the Number 15815

Fifteen Thousand Eight Hundred Fifteen

Basics

Value: 15814 → 15815 → 15816

Parity: odd

Prime: No

Previous Prime: 15809

Next Prime: 15817

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 3163

Divisors: 1, 5, 3163, 15815

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11110111000111

Octal: 36707

Duodecimal: 919B

Hexadecimal: 3dc7

Square: 250114225

Square Root: 125.75770354137356

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

Number of integer partitions of n whose parts have choosable sets of strict integer partitions. A387178

a(n) = n*(n-th prime) + (n+1)*((n+1)-th prime). A152117

Numbers n for which the digital sum contains the same distinct digits as the digital product but the digital sum is not equal to the digital product. A249335

Least number k not divisible by 10 such that the decimal expansion of kⁿ contains some digit exactly n times. A243151

Number of set partitions of [n] such that the difference between each element and its block index is a multiple of nine. A274842

Least number·such that xⁿ has n digits equal to k. Case k = 8. A285455

Values of n such that L(18) and N(18) are both prime, where L(k) = (n²+n+1)*2^2·k + (2·n+1)*2^k + 1, N(k) = (n²+n+1)*2^k + n. A227521

Number of pairs in generation n of the tree T defined in Comments. A252864

a(n) = prime(2·n²) - 2·n². A141086

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (0, 1, 1), (1, -1, 0), (1, -1, 1)}. A148760