Properties of the Number 61490

Sixty-One Thousand Four Hundred Ninety

Basics

Value: 61489 → 61490 → 61491

Parity: even

Prime: No

Previous Prime: 61487

Next Prime: 61493

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 5 × 11 × 13 × 43

Divisors: 1, 2, 5, 10, 11, 13, 22, 26, 43, 55

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111000000110010

Octal: 170062

Duodecimal: 2B702

Hexadecimal: f032

Square: 3781020100

Square Root: 247.9717725871233

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

Triangle read by rows: T(n,k) = T(n-1,k-1) + k²*T(n-1,k), 1 < k <= n, T(n,1) = 1. A36969

Triangle read by rows. Stirling set numbers of order 2, T(n, n) = 1, T(n, k) = 0 if k < 0 or k > n, otherwise T(n, k) = T(n-1, k-1) + k²*T(n-1, k), for 0 <= k <= n. A269945

Triangle of central factorial numbers T(2·n,2·n-2·k), k >= 0, n >= 1 (in Riordan's notation). A8957

a(n) = ∑_k=1..n ∑_j=1..k ∑_i=1..j (i·j*k)². A351105

Central elements in 3-Pascal triangle A028262 (by row). A28270

Constant term of the reduction by x²->x+1 of the polynomial p(n,x) defined below in Comments. A192754

Duplicate of A028270. A81497

Expansion of 1/((1-x) * (1-4·x) * (1-9·x) * (1-16·x) * (1-25·x)). A383840

Consecutive states of the linear congruential pseudo-random number generator 228·s mod (2¹⁶+1) when started at s=1. A385079

Table read by rows: list of even numbers to the right of the central elements of the (2,3)-Pascal triangle A029600. A29617