Properties of the Number 71980

Seventy-One Thousand Nine Hundred Eighty

Basics

Value: 71979 → 71980 → 71981

Parity: even

Prime: No

Previous Prime: 71971

Next Prime: 71983

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5 × 59 × 61

Divisors: 1, 2, 4, 5, 10, 20, 59, 61, 118, 122

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001100100101100

Octal: 214454

Duodecimal: 357A4

Hexadecimal: 1192c

Square: 5181120400

Square Root: 268.29088691194863

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

Nonnegative values·of solutions (x, y) to the Diophantine equation x²+(x+161)² = y². A206426

Irregular triangle read by rows: T(n,k) is the number of sensed 3-connected planar maps with n >= 4 faces and k >= 4 vertices. A239893

a(n) = 2·A000447(n). A259110

Number of nX3 0..1 arrays with every element unequal to 1, 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero. A305084

If n = abcd (say) in decimal, then a(n) = a + ab + abc + abcd + bcd + cd + d. A71980

a(n) = sum of numbers formed using the digits of next n numbers. A81993