Properties of the Number 13621

Thirteen Thousand Six Hundred Twenty-One

Basics

Value: 13620 → 13621 → 13622

Parity: odd

Prime: No

Previous Prime: 13619

Next Prime: 13627

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 53 × 257

Divisors: 1, 53, 257, 13621

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 11010100110101

Octal: 32465

Duodecimal: 7A71

Hexadecimal: 3535

Square: 185531641

Square Root: 116.70903992407786

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

Numbers that can be written in exactly two different ways as s₁^x_1 + ... + s_t^x_t, with 1 < s₁ < ... < s_t and {s₁,..., s_t} = {x₁,..., x_t} for some t > 0. A386966

Number of distinct sums i³ + j³ + k³ + l³ for 0<=i<=j<=k<=l<=n. A374711

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where A(n,k) = n! * k! * [xⁿ * y^k] exp(x+y) / (exp(x) + exp(y) - exp(x+y))⁴. A382674

a(n) = ∑_i=1..n ∑_j=1..i (prime(i)² - prime(j)²). A62021

Numbers n such that RevBinary(RevDecimal(n))=RevDecimal(RevBinary(n)), where RevDecimal(n) is the decimal reversal of n (A004086) and RevBinary(n) is the binary reversal of n (A030101). A81433

Number of 2 X 2 matrices with all elements in {0,...,n} and prime determinant. A281315

Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 9. A31422

Record-setting differences between adjacent elements of the Mian-Chowla sequence A005282. A80222

Numbers k such that the continued fraction for sqrt(k) has period 99. A20438

Numbers n of the form k + reverse(k) for exactly three k. A71914