Properties of the Number 71861

Seventy-One Thousand Eight Hundred Sixty-One

Basics

Value: 71860 → 71861 → 71862

Parity: odd

Prime: Yes

Previous Prime: 71849

Next Prime: 71867

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 71861

Divisors: 1, 71861

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001100010110101

Octal: 214265

Duodecimal: 35705

Hexadecimal: 118b5

Square: 5164003321

Square Root: 268.0690209628856

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

a(n) = (1/n) times the n-th derivative of the fifth tetration of x (power tower of order 5) x^⁵ at x=1. A295105

Triangle, read by rows, of permutations of length n with k white global corners. A213166

Lesser of two consecutive primes, p < q, such that p·q + p - q and p·q - p + q are also consecutive primes. A225726

Number of nX5 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A300636

Numbers k such that 123456789·10^k+1 is prime. A322985

Primes p such that the 3 X 3 matrix with components (row by row) prime(k+m), 0 <= m <= 8 has zero determinant, where p = prime(k). A337160

A(n,k) is (1/n) times the n-th derivative of the k-th tetration of x (power tower of order k) x^^k at x=1; square array A(n,k), n>=1, k>=1, read by antidiagonals. A295028

T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A300639

Numbers k such that the largest prime factor of k is equal to the sum of primes dividing k+1 (with repetition). A71861