Properties of the Number 31979

Thirty-One Thousand Nine Hundred Seventy-Nine

Basics

Value: 31978 → 31979 → 31980

Parity: odd

Prime: No

Previous Prime: 31973

Next Prime: 31981

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 113 × 283

Divisors: 1, 113, 283, 31979

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 111110011101011

Octal: 76353

Duodecimal: 1660B

Hexadecimal: 7ceb

Square: 1022656441

Square Root: 178.82673178247148

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

Numbers that are the sum of 3 nonzero 6th powers. A3359

Numbers n such that m=(n²+1)/2, p=(m²+1)/2 and q=(p²+1)/2 are all prime. A188546

a(n) = n*(n² - 1)/2 - 1. A117560

Semiprimes that are (perimeter² - hypotenuse²) of a Pythagorean triple. A389589

Number of kites, distinct up to congruence, on an n X n grid (or geoboard). A181946

a(1)=1; a(n) = floor((3 + sqrt(21))*a(n-1)/2) for n > 1. A196472

Numbers n such that n and its reversal are distinct brilliant numbers (A078972). A97435

Indices of the primes of |A007442|. A359629

Decimal expansion of the sum of the reciprocals of the positive even-indexed Pell numbers. A391706

Decimal expansion of the sum of the reciprocals of the odd-indexed Pell numbers. A391707