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Properties of the Number 19913

Nineteen Thousand Nine Hundred Thirteen

Basics

Value: 19912 → 19913 → 19914

Parity: odd

Prime: Yes

Previous Prime: 19891

Next Prime: 19919

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 19913

Divisors: 1, 19913

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110111001001

Octal: 46711

Duodecimal: B635

Hexadecimal: 4dc9

Square: 396527569

Square Root: 141.1134295522577

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 k such that 9k - 8k is prime. A59803
Where the prime race among 9k+1, ..., 9k+8 changes leader. A297407
Primes p such that q = p+d (with d >= 6) is the next prime and both p and q are Sophie Germain primes. A128825
Numbers at the start of a run of 2 or more consecutive primes that are Sophie Germain primes. A339474
Primes p such that p's set of distinct digits is {1,3,9}. A108383
Numbers at the start of a run of exactly 2 consecutive primes that are Sophie Germain primes. A339475
Emirps whose internal digits are also an emirp. A225235
Number of polynomials ak*xk + ... + a1*x + a0 with k > 0, integer coefficients and only non-multiple positive integer roots and a0 = pn (p is a prime). A248956
Number of binary necklaces of length n with no subsequence 00000. A280303
a(n) = ∑1 <= i <= j <= k <= n gcd(i,j,k). A344521