Properties of the Number 51040

Fifty-One Thousand Forty

Basics

Value: 51039 → 51040 → 51041

Parity: even

Prime: No

Previous Prime: 51031

Next Prime: 51043

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 ⁵ × 5 × 11 × 29

Divisors: 1, 2, 4, 5, 8, 10, 11, 16, 20, 22

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1100011101100000

Octal: 143540

Duodecimal: 25654

Hexadecimal: c760

Square: 2605081600

Square Root: 225.92033994308701

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

Triangular numbers with sum of digits = 10. A68129

Number of permutations p of {1..2n} such that p[2k-1]<p[2k] <=> p[2k]<p[2k+1]. A261683

Array read by antidiagonals: T(m,n) (m>=1, n>=1) = number of m X n whirlpool permutations. A334518

Triangle read by rows: T(n,k) (1<=k<=n) = number of n X k whirlpool permutations (see A334518). A334519

Triangular numbers whose digit permutations yield at least two further triangular numbers. A69674

Triangular numbers > 0 with a prime signature that has not occurred earlier. A85076

Triangular numbers whose sum of prime factors (with repetition) is also triangular. A76169

Triangular numbers in which the sum of the external digits equals the sum of the internal digits. A88289

a(n) = number of terms in A213717 whose magnitude is in range [(2ⁿ)-1,(2ⁿ⁺¹)-2] (or equally, in range [(2ⁿ),(2ⁿ⁺¹)-1]). A213722

Numbers that start a run of four consecutive triangular numbers with four distinct prime factors. A349773