Properties of the Number -15625

Fifteen Thousand Six Hundred Twenty-Five

Basics

Value: -15626 → -15625 → -15624

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 ⁶

Divisors: 1, 5, 25, 125, 625, 3125, 15625

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11110100001001

Octal: -36411

Duodecimal: -9061

Hexadecimal: -3d09

Square: 244140625

Square Root: 125

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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 read by rows. T(n, m) are the coefficients of Sidi polynomials. A75513

Expansion of 1/sqrt(1 - 2·x + 5·x²). A98331

Coefficient of xⁿ in (∏_m=1..n(1-x^m))ⁿ. A8705

Product of all divisors of n, positive or negative. A217854

Expansion of ∏_k>=1 (1 - x^k)¹⁴. A10821

Triangle T(n,k) read by rows: T(n,n) = -1, T(n,0) = 5^{n - 1}, T(n,k) = -5^{n - k - 1}, 1 <= k <= n - 1. A152572

a(n) = the numerator of ( ∑_{k = 1..n} (-1)^n+k*(1/k³)*binomial(n,k)* binomial(n+k,k)² ). A357561

Bisection of A008705. A262309

Triangle, T(n, k) = k⁶ - n⁶ - 5*(n·k)²*(n² - k²) + 4·n*k*((n·k)⁴ - 1), read by rows. A123964

a(n) = a(n-1)² - nⁿ⁺¹. A193637