Properties of the Number 31421

Thirty-One Thousand Four Hundred Twenty-One

Basics

Value: 31420 → 31421 → 31422

Parity: odd

Prime: No

Previous Prime: 31397

Next Prime: 31469

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 13 × 2417

Divisors: 1, 13, 2417, 31421

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111101010111101

Octal: 75275

Duodecimal: 16225

Hexadecimal: 7abd

Square: 987279241

Square Root: 177.2596964907703

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

Number of subsets of {1..n} containing n such that it is possible to choose a different binary index of each element. A370639

a(n) = ∑_{k=0..floor(n/4)} C(n-3·k,k+1). A98578

Apply partial sum operator 5 times to partition numbers. A120477

a(n) = n·prime(prime(n)) - prime(n). A230285

Number of unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 4. A244458

Sum of squares of five consecutive primes. A131686

Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= (n-1)/3. A48006

Number of length n left factors of Dyck paths having no UDUD's; here U=(1,1) and D=(1,-1). A191792

The Wiener index of the graph obtained by applying Mycielski's construction to a benzenoid consisting of a linear chain of n hexagons. A228597

Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= (n-2)/3. A48017