Properties of the Number 31531

Thirty-One Thousand Five Hundred Thirty-One

Basics

Value: 31530 → 31531 → 31532

Parity: odd

Prime: Yes

Previous Prime: 31517

Next Prime: 31541

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 31531

Divisors: 1, 31531

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111101100101011

Octal: 75453

Duodecimal: 162B7

Hexadecimal: 7b2b

Square: 994203961

Square Root: 177.5697046232831

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

Decimal Goedelization of antitheorems from propositional calculus, in Richard C. Schroeppel's metatheory of A101273. A100200

Primes of the form abcabc..abcab. A228627

Larger of emirp pairs whose digital sums are also emirps (A178091). A178093

Emirps p such that (p·q) mod (p+q) is also an emirp, where q is the digit reversal of p. A355651

Expansion of (1-x)^-1/(1-2·x-3·x²-2·x³). A77826

Let a(1)=1; for n>1 a(n)=nextprime(a(n-1)+(a(n-1)+1)/4). A175953

Number of third differences of arrays of length 5 of numbers in 0..n. A228261

Number of (1+1) X (n+1) arrays of permutations of 0..n·2+1 filled by rows with each element moved a city block distance of 0 or 2, and rows and columns in increasing lexicographic order. A263603

Primes such that the sum of the squares of its digits is equal to the product of its digits. A67779

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), (-1, 0, 0), (1, -1, 0), (1, 1, 0)}. A149514