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Properties of the Number 31081

Thirty-One Thousand Eighty-One

Basics

Value: 31080 → 31081 → 31082

Parity: odd

Prime: Yes

Previous Prime: 31079

Next Prime: 31091

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 31081

Divisors: 1, 31081

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111100101101001

Octal: 74551

Duodecimal: 15BA1

Hexadecimal: 7969

Square: 966028561

Square Root: 176.2980430974774

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

Reflectable emirps. A7628
T(n,k)=Number of nXk 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1. A297395
Numbers k such that k, k+1, k+2 and k+3 are 1,2,3,4-almost primes. A113000
Primes in A005891 = Centered pentagonal numbers: (5n2 + 5n + 2)/2. A145838
Number of compositions of 2n into parts with multiplicity <= n. A232605
Number of compositions of n into parts with multiplicity not larger than 8. A243086
Greater of twin primes p such that 3·p-2 is also greater of twin primes. A177336
Larger of emirp pairs whose digital sums are also emirps (A178091). A178093
Primes p of the form 420k + 1 for some k. A217587
Expansion of 1/(1 - x3 - x4 - x5 - x6 + x9). A225484