Properties of the Number 981

Nine Hundred Eighty-One

Basics

Value: 980 → 981 → 982

Parity: odd

Prime: No

Previous Prime: 977

Next Prime: 983

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 109

Divisors: 1, 3, 9, 109, 327, 981

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111010101

Octal: 1725

Duodecimal: 699

Hexadecimal: 3d5

Square: 962361

Square Root: 31.32091952673165

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

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 partitions of n into at least two distinct parts. A111133

Coordination sequence for "flu" 3D uniform tiling formed from tetrahedra, rhombicuboctahedra, and cubes. A299272

Number of partitions of n-1 boys and one girl with no couple. A120452

Number of partitions of n of order n. A74761

Multiples of 9 containing a 9 in their decimal representation. A121029

Generalized 29-gonal (or icosienneagonal) numbers: m*(27·m - 25)/2 with m = 0, +1, -1, +2, -2, +3, -3, ... A303815

Numbers m such that there are precisely 5 groups of order m. A54397

Generalized 24-gonal (or icositetragonal) numbers: m*(11·m - 10) with m = 0, +1, -1, +2, -2, +3, -3, ... A303814

Number of strict integer partitions of n with a part dividing all the other parts. A97986