Properties of the Number 15645

Fifteen Thousand Six Hundred Forty-Five

Basics

Value: 15644 → 15645 → 15646

Parity: odd

Prime: No

Previous Prime: 15643

Next Prime: 15647

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 7 × 149

Divisors: 1, 3, 5, 7, 15, 21, 35, 105, 149, 447

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11110100011101

Octal: 36435

Duodecimal: 9079

Hexadecimal: 3d1d

Square: 244766025

Square Root: 125.0799744163709

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

"Orderly" Friedman numbers (or "good" or "nice" Friedman numbers): Friedman numbers (A036057) where the construction digits are used in the proper order. A80035

Numbers k such that k-4, k-2, k+2 and k+4 are prime. A173037

Expansion of e.g.f. A(x) satisfying A(x) = ∑_n>=0 (A(x)ⁿ + 4)ⁿ * xⁿ/n!. A361055

Number of distinct prime factors of the n-th odd Catalan number, A038003(n). A119861

Integers N such that by inserting + or - or·or / or ^ between each of their digits, without any grouping parentheses, you can get N (the ambiguous a^b^c is avoided). A156954

Exponents k where A000120(3^k) - A070939(3^k)/2 reaches a new minimum. A372097

Obtainable by applying +, * and exponentiation to its own digits. A46469

Products p·q*r·s of distinct primes for which (p·q*r·s + 1)/2 is prime. A234501

a(n) = 123·2ⁿ - 99. A305160

Triangle read by rows T(n, k) = ∑_h>=0 Bernoulli(h)*binomial(k+h-1, h)*abs(Stirling1(n, h+k))*n^h for n>=0 and 0<=k<=n. A339207