Properties of the Number 15681

Fifteen Thousand Six Hundred Eighty-One

Basics

Value: 15680 → 15681 → 15682

Parity: odd

Prime: No

Previous Prime: 15679

Next Prime: 15683

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5227

Divisors: 1, 3, 5227, 15681

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11110101000001

Octal: 36501

Duodecimal: 90A9

Hexadecimal: 3d41

Square: 245893761

Square Root: 125.22379965485794

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 ways to split a strict integer partition of n into consecutive subsequences with weakly decreasing sums. A319794

Numbers k such that k² contains exactly 9 different digits. A54037

Numbers whose square is a zeroless pandigital number (i.e., use the digits 1 through 9 once). A71519

T(n,k)=Number of arrays of n integers in -k..k with sum zero and equal numbers of elements greater than zero and less than zero. A201811

Number of compositions c of n such that no three points (i,c_i), (j,c_j), (k,c_k) are collinear, where c_i denotes the i-th part. A238686

8-step Fibonacci sequence starting with 0,0,0,0,1,0,0,0. A251741

a(n) = 20·n² + 1. A158493

Absolute value of coefficient of X² in the characteristic polynomial of the n-th power of the matrix M = {{1,1,1,1,1}, {1,0,0,0,0}, {0,1,0,0,0}, {0,0,1,0,0}, {0,0,0,1,0}}. A123126

7-step Fibonacci sequence starting with (0,0,0,0,0,1,0). A251710

Numbers k such that any two consecutive decimal digits of k² differ by 1 after arranging the digits in decreasing order. A370362