Properties of the Number 61380

Sixty-One Thousand Three Hundred Eighty

Basics

Value: 61379 → 61380 → 61381

Parity: even

Prime: No

Previous Prime: 61379

Next Prime: 61381

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ² × 5 × 11 × 31

Divisors: 1, 2, 3, 4, 5, 6, 9, 10, 11, 12

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1110111111000100

Octal: 167704

Duodecimal: 2B630

Hexadecimal: efc4

Square: 3767504400

Square Root: 247.74987386475092

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 T, read by rows, such that the matrix inverse satisfies: [T^-1](n,k) = -(k+1)*T(n-1,0) for n>k>=0, with T(n,n)=1 for n>=0. A112911

Let p = n-th prime == 7 mod 8; a(n) = sum of quadratic residues mod p that are < p/2. A282039

Column 2 of triangle A112911. A112913

a(n) is the number in the first column of the Trithoff (tribonacci) array that starts off the row containing the tail of n times the tribonacci sequence. A351689

a(n) = floor(n*(n-1)*(n-2)*(n-3)/16). A11926

Triangle of nonzero coefficients of the Airy ζ functions expressed as polynomials of X = 3^5/6γ(2/3)²/(2Pi). A96631

Averages of twin prime pairs of A074378. A154563

Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 1 vertically. A207449

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 873", based on the 5-celled von Neumann neighborhood. A273709

Numbers k satisfying gcd(k², σ(k²)) > σ(k), where σ is the sum-of-divisors function. A322154