Properties of the Number -657

Six Hundred Fifty-Seven

Basics

Value: -658 → -657 → -656

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 73

Divisors: 1, 3, 9, 73, 219, 657

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1010010001

Octal: -1221

Duodecimal: -469

Hexadecimal: -291

Square: 431649

Square Root: 25.632011235952593

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

Expansion of 1/(1 - x*∏_k>=1 1/(1 + x^k)). A299208

a(n) is the smallest error in trying to solve n⁴ = x⁴ + y⁴. That is, for each n from 2 on, find positive integers·and y, x <= y < n such that |n⁴ - x⁴ - y⁴| is minimal and let a(n) = n⁴ - x⁴ - y⁴. A308834

Inverse Euler transform of {A001285(0), A001285(1), ...} where A001285(n) is Thue-Morse sequence. A29878

Alternating sum of 11-gonal (or hendecagonal) numbers. A266087

Triangle of coefficients of numerators of powers of e² in ∑_k>=1 {1 / (1 + (k+1/2)²*π²)ⁿ} + {4ⁿ / (4+π²)ⁿ}. A85471

Odd numbers of the form p^1+4k * r², where p is prime of the form 1+4m, r > 1, and gcd(p,r) = 1. (Euler's criteria for odd perfect numbers). A228058

Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and w² + x·y = 0. A211422

a(n) = a(n-1) + a(n-4) with a(0) = 0, a(1) = a(2) = a(3) = 1. A3269

Numbers k such that the k-th composition in standard order is a permutation (of an initial interval). A333218

Numbers which are the sum of 3 nonzero 4th powers. A3337