Properties of the Number 31990

Thirty-One Thousand Nine Hundred Ninety

Basics

Value: 31989 → 31990 → 31991

Parity: even

Prime: No

Previous Prime: 31981

Next Prime: 31991

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 5 × 7 × 457

Divisors: 1, 2, 5, 7, 10, 14, 35, 70, 457, 914

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111110011110110

Octal: 76366

Duodecimal: 1661A

Hexadecimal: 7cf6

Square: 1023360100

Square Root: 178.85748516626302

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

Expansion of e.g.f. 1/( ∑_n>=0 (-x)^n² / (n²)! ). A205802

Capped binary boundary codes for holeless strictly non-overlapping polyhexes (all orientations and rotations included). A258002

Capped binary boundary codes for fusenes (all orientations and rotations included). A258012

Indices where Mertens function A002321 reaches record amplitudes between zeros. A304241

Expansion of 1/(1 - 8·x + 4·x²)^5/2. A387343

Number of n X 2 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 3 binary array having a sum of zero, with rows and columns of the latter in lexicographically nondecreasing order. A227121

Duplicate of A023747. A31990