Properties of the Number 6520

Six Thousand Five Hundred Twenty

Basics

Value: 6519 → 6520 → 6521

Parity: even

Prime: No

Previous Prime: 6491

Next Prime: 6521

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ³ × 5 × 163

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 163, 326

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1100101111000

Octal: 14570

Duodecimal: 3934

Hexadecimal: 1978

Square: 42510400

Square Root: 80.7465169527454

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

Second 10-gonal (or decagonal) numbers: n*(4·n+3). A33954

Coordination sequence for "tcd" 3D uniform tiling. A299287

Sum of quadratic residues of (n-th prime == 3 mod 4). A282035

Sum of the quadratic residues of prime(n). A76409

T(n,k)=Number of nXk 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors. A208872

T(n,k)=Number of n-step one space leftwards or up, two space rightwards or down asymmetric rook's tours on a kXk board summed over all starting positions. A187296

Number of integer partitions of n where the parts have greater mean than the distinct parts. A360250

a(n) = 1 + (n-1) + (n-2)*[(n-3)/2] + (n-3)*[(n-4)/2]*[(n-5)/3] + (n-4)*[(n-5)/2]*[(n-6)/3]*[(n-7)/4] +... where [x] = floor(x), with summation extending over the initial [n/2+1] products only. A207644

Numbers k such that k and k+5 are 5-almost primes. A124942

Triangle T(n,k) = 1 - A176304(k) - A176304(n-k) + A176304(n), read by rows. A176306