Properties of the Number 2139

Two Thousand One Hundred Thirty-Nine

Basics

Value: 2138 → 2139 → 2140

Parity: odd

Prime: No

Previous Prime: 2137

Next Prime: 2141

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 23 × 31

Divisors: 1, 3, 23, 31, 69, 93, 713, 2139

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100001011011

Octal: 4133

Duodecimal: 12A3

Hexadecimal: 85b

Square: 4575321

Square Root: 46.24932431938871

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

a(n) = n*(4·n+1). A7742

Expansion of g.f. x*(1 + 3·x)/((1 + x)*(1 - x)³). A35608

Numbers k such that 2^k + 3 is prime. A57732

Expansion of 1 / ∏_k>=1 (1-x^k)^k+1. A5380

Number of integer partitions of n with more than one mode. A362607

Even triangular numbers halved. A74378

Squarefree numbers with a divisor having the same sum of prime indices as their quotient. A357854

Numbers k such that the half-alternating sum of the prime indices of k is 0. A357631

a(n) = (n-1)*(2·n+5). A130861

Nonprime squarefree numbers whose product of prime indices is divisible by their sum of prime indices. A326158