Properties of the Number 81078

Eighty-One Thousand Seventy-Eight

Basics

Value: 81077 → 81078 → 81079

Parity: even

Prime: No

Previous Prime: 81077

Next Prime: 81083

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 13513

Divisors: 1, 2, 3, 6, 13513, 27026, 40539, 81078

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110010110110

Octal: 236266

Duodecimal: 3AB06

Hexadecimal: 13cb6

Square: 6573642084

Square Root: 284.741988473776

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

Number T(n,k) of ordered set partitions of [n] where k is minimal such that for each block b the smallest integer interval containing b has at most k elements; triangle T(n,k), n>=0, 0<=k<=n, read by rows. A276891

Number of ordered set partitions of [n] where k = seven is minimal such that for each block b the smallest integer interval containing b has at most k elements. A320620

a(n) = ∑_k=0..n-1 (-1)^k*k·A000172(k). A207319

a(n) = Lucas(4n) - 3, or Lucas(2n-1)*Lucas(2n+1). A81078