Properties of the Number 12139

Twelve Thousand One Hundred Thirty-Nine

Basics

Value: 12138 → 12139 → 12140

Parity: odd

Prime: No

Previous Prime: 12119

Next Prime: 12143

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 61 × 199

Divisors: 1, 61, 199, 12139

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10111101101011

Octal: 27553

Duodecimal: 7037

Hexadecimal: 2f6b

Square: 147355321

Square Root: 110.17713011328621

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

Triangle of coefficients in expansion of (x+1)*(x+3)*...*(x + 2n - 1) in rising powers of x. A28338

Numerators of coefficients in Taylor series expansion of log(1+x)²/sqrt(1+x). A2551

Triangle of coefficients in expansion of (x-1)*(x-3)*(x-5)*...*(x-(2·n-1)). A39757

Number of n-node graphs that have 2 non-isomorphic components. A275166

Triangle of coefficients in expansion of (1+x)*(1+3x)*(1+5x)*(1+7x)*...*(1+(2n-1)x). A109692

a(1) = 3; for n>0, a(n+1) = a(n) + floor((a(n)-1)/2). A3312

Numbers k that are the products of two distinct primes such that 2·k-1, 4·k-3, 8·k-7, 16·k-15 and 32·k-31 are also products of two distinct primes. A177214

Coefficient of x² in expansion of (x+1)*(x+3)*...*(x+2·n-1). A28339

Numbers k that are the products of two distinct primes such that 2·k-1, 4·k-3, 8·k-7, 16·k-15, 32·k-31 and 64·k-63 are also products of two distinct primes. A177215

Triangular matrix T defined by T = exp(L) where L(n,k) = C(2·n, 2·k+1)/2, as read by rows n >= 0, k=0..n. A246381