Properties of the Number 19961

Nineteen Thousand Nine Hundred Sixty-One

Basics

Value: 19960 → 19961 → 19962

Parity: odd

Prime: Yes

Previous Prime: 19949

Next Prime: 19963

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 19961

Divisors: 1, 19961

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110111111001

Octal: 46771

Duodecimal: B675

Hexadecimal: 4df9

Square: 398441521

Square Root: 141.2834031300209

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

24 'Reverse and Add' steps are needed to reach a palindrome. A65318

Smallest SanD-d prime p (such that p + d is also prime and digit sum A007953(p(p+d)) = d) with d = 14 + n·18, n >= 0, resp. d = 5 for n = -1. A307480

Number of integer partitions y of n whose rank Sum_i 2^y_i-1 is prime. A372688

Primes p such that A001175(p) = (p-1)/4. A308789

Primes that become squares when prefixed with a 2. A167735

Primes having only {1, 6, 9} as digits. A363023

Primes p2 such that p1² + p2³ is an average of twin primes and p1 < p2 are consecutive primes. A138716

Primes p such that p³ - 12 and p³ + 12 are also primes. A153322

Primes that remain prime through 4 iterations of function f(x) = 9x + 2. A23324

Primes p such that p+2 and q are primes, where q is concatenation of binary representations of p and p+2: q = p·2^L + p+2, where L is the length of binary representation of p+2: L=A070939(p+2). A232238