Properties of the Number 31988

Thirty-One Thousand Nine Hundred Eighty-Eight

Basics

Value: 31987 → 31988 → 31989

Parity: even

Prime: No

Previous Prime: 31981

Next Prime: 31991

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 11 × 727

Divisors: 1, 2, 4, 11, 22, 44, 727, 1454, 2908, 7997

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111110011110100

Octal: 76364

Duodecimal: 16618

Hexadecimal: 7cf4

Square: 1023232144

Square Root: 178.85189403526036

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 non-averaging permutations of [n] with first element n. A296530

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 205", based on the 5-celled von Neumann neighborhood. A270731

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 539", based on the 5-celled von Neumann neighborhood. A272803

Triangle read by rows: T(n,k) is the number of hill-free Schroeder paths of length 2n and having k ascents (n>=1; 0<=k<=n-1). A Schroeder path of length 2n is a lattice path from (0,0) to (2n,0) consisting of U=(1,1), D=(1,-1) and H=(2,0) steps and never going below the x-axis. A hill is a peak at height 1. An ascent in a Schroeder path is a maximal sequence of consecutive U steps. A114706

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, 0, 1), (0, -1, 1), (0, 1, 1), (1, 1, -1)}. A149004

Duplicate of A023745. A31988