Properties of the Number 51488

Fifty-One Thousand Four Hundred Eighty-Eight

Basics

Value: 51487 → 51488 → 51489

Parity: even

Prime: No

Previous Prime: 51487

Next Prime: 51503

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ⁵ × 1609

Divisors: 1, 2, 4, 8, 16, 32, 1609, 3218, 6436, 12872

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1100100100100000

Octal: 144440

Duodecimal: 25968

Hexadecimal: c920

Square: 2651014144

Square Root: 226.90967365892536

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 array T(n,k), read by rows: coefficients of strong divisibility sequence of polynomials p(1,x) = 1, p(2,x) = 2 + 4·x, p(n,x) = u·p(n-1,x) + v·p(n-2,x) for n >= 3, where u = p(2,x), v = 1 - 2·x - x². A367298

Starts of runs of 4 consecutive positive negabinary-Niven numbers (A331728). A331824

Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 30", based on the 5-celled von Neumann neighborhood. A285538

Number of partitions of n*(n-1)/2 into at most four parts. A274099

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7. A252567

Least number·such that xⁿ has n digits equal to k. Case k = 1. A285448

Triangle read by rows: T(n, k) = binomial(n, k)/β(n+1, n-k+1) + binomial(n, n-k)/β(n+1, k+1). A156052

a(n) = 12·n³ + 9·n² + 2·n. A191745

Number of horizontal steps in the valleys of all bargraphs having semiperimeter n (n >=2). A278135

a(n) = ∑_k=0..2n-3 T(n,k) * T(n,k+3), with T given by A026568. A27280