Properties of the Number -2155

One Hundred Fifty-Five

Basics

Value: -2156 → -2155 → -2154

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 431

Divisors: 1, 5, 431, 2155

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100001101011

Octal: -4153

Duodecimal: -12B7

Hexadecimal: -86b

Square: 4644025

Square Root: 46.42197755374064

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

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of ∏_j>=1 (1-j·x^j)^{j^(k·j}) in powers of x. A294605

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of ∏_j>=1 (1-j^k·j*x^j)^j in powers of x. A294808

Expansion of ∏_k>=1 (1 - k^2·k*x^k)^k. A294953

Expansion of ∏_k>=1 (1 - k·x^k)^{k^(2·k}). A294607

Number of balls in pyramid with base either a regular hexagon or a hexagon with alternate sides differing by 1 (balls in hexagonal pyramid of height n taken from hexagonal close-packing). A19298

Smallest number whose cube has n digits. A18005

L-toothpick sequence (see Comment lines for definition). A172310

a(n) = T(n, floor(n/2)), where T is given by A026584. A26595

Number of integer partitions y of n such that y_i = y_i+1 for all even i. A351003

a(n) = T(2·n-1, n-1), where T is given by A026584. A26593