Properties of the Number 12158

Twelve Thousand One Hundred Fifty-Eight

Basics

Value: 12157 → 12158 → 12159

Parity: even

Prime: No

Previous Prime: 12157

Next Prime: 12161

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 6079

Divisors: 1, 2, 6079, 12158

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10111101111110

Octal: 27576

Duodecimal: 7052

Hexadecimal: 2f7e

Square: 147816964

Square Root: 110.26332119068425

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

Let f(k) = exp(π*sqrt(k)); sequence gives numbers k such that ceiling(f(k)) - f(k) < 1/10³. A127022

Least positive k such that k * [RSA-640]ⁿ - 1 is prime, where RSA-640 is the 193 decimal digit RSA challenge number A391940(14). A108573

a(n) = ( 2·n*(2·n² + 9·n + 14) + (-1)ⁿ - 1 )/16. A248851

Expansion of (η(q¹³) / η(q))² in powers of q. A121597

a(n) = ∑_k=1..n binomial(k+3,3) * floor(n/k). A366985

a(n) = ADPE(n) is the total number of aperiodic k-double-palindromes of n up to cyclic equivalence, where 1 <= k <= n. A181314

Coordination sequence for CaF2(1), Ca position. A9923

"BGK" (reversible, element, unlabeled) transform of 1,1,1,1,... A32058

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 219", based on the 5-celled von Neumann neighborhood. A270932

Expansion of (1-x)^-1/(1+x²-2·x³). A77887