Properties of the Number 31591

Thirty-One Thousand Five Hundred Ninety-One

Basics

Value: 31590 → 31591 → 31592

Parity: odd

Prime: No

Previous Prime: 31583

Next Prime: 31601

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 7 × 4513

Divisors: 1, 7, 4513, 31591

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 111101101100111

Octal: 75547

Duodecimal: 16347

Hexadecimal: 7b67

Square: 997991281

Square Root: 177.73857206582932

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

Iccanobirt numbers (15 of 15): a(n) = R(R(a(n-1)) + R(a(n-2)) + R(a(n-3))), where R is the digit reversal function A004086. A102125

Iccanobirt semiprimes (15 of 15): Semiprime numbers in A102125. A102205

Least integer b>2n+1 such that the numbers written as [1,3,...,2n-1,2n+1] and [2n+1,2n-1,...,3,1] in base b are both prime. A218465

T(n,k)=Number of nXk arrays containing k copies of 0..n-1 with every element equal to or 1 greater than any northeast or northwest neighbors modulo n and the upper left element equal to 0. A267019

a(n) = 13 + 165·n + 756·n² + 1470·n³ + 1029·n⁴. A134159

a(n) = (∑_{k=1..A047380(n)} k⁶) / (∑_{k=1..A047380(n)} k²). A133180

Numerator(1+1/prime(1)³+ ... + 1/prime(n)³) where prime(k) is the k-th prime. A75987

Reversals of tribonacci numbers (sorted). A215649

Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any northeast or northwest neighbors modulo 4 and the upper left element equal to 0. A267023

Number of partitions of n into parts not of the form 19k, 19k+2 or 19k-2. Also number of partitions with 1 part of size 1 and differences between parts at distance 8 are greater than 1. A35971