Properties of the Number 13861

Thirteen Thousand Eight Hundred Sixty-One

Basics

Value: 13860 → 13861 → 13862

Parity: odd

Prime: No

Previous Prime: 13859

Next Prime: 13873

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 83 × 167

Divisors: 1, 83, 167, 13861

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11011000100101

Octal: 33045

Duodecimal: 8031

Hexadecimal: 3625

Square: 192127321

Square Root: 117.73274820541648

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

a(n) = p*(p-1)/2 for p = prime(n). A8837

Triangular numbers which are the product of two primes. A68443

Primitive numbers in A229307. A229311

Primitive numbers in A229306. A229310

a(n) = (2·n-1)*(4·n-1). A33567

Product p·q of two primes with q = 2·p + 1. A156592

Centered 14-gonal numbers. A69127

Least number k > 1 (that is not the power of prime p) such that k divides (p+1)^k-1, where p = prime(n). A128356

Centered 22-gonal numbers. A69173

a(n) = 6·a(n-1) - a(n-2) - 4 with n > 1, a(0)=1, a(1)=3. A182189