Properties of the Number 19861

Nineteen Thousand Eight Hundred Sixty-One

Basics

Value: 19860 → 19861 → 19862

Parity: odd

Prime: Yes

Previous Prime: 19853

Next Prime: 19867

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 19861

Divisors: 1, 19861

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110110010101

Octal: 46625

Duodecimal: B5B1

Hexadecimal: 4d95

Square: 394459321

Square Root: 140.92906016858268

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

Strobogrammatic primes. A7597

Primes of the form 2·n² + 54·n + 25. A217497

Irregular table read by rows: T(n,k) is the number of k-gons, k>=2, among all distinct circles that can be constructed from an n·n square grid of points using only a compass. A359935

Strobogrammatic primes: the same upside down (calculator-style numerals). A18847

Primes p such that the sum of the digits of p is not prime, but the sum of the cubes of the digits of p is prime. A91365

Non-palindromic balanced primes in base 2. A256081

Least prime p such that p minus the multiplication of its digits is the n-th prime before p. A321570

Prime numbers p such that p +- ((p-1)/5) are primes. A137714

Largest primes of 'a' consecutive primes whose sum is a prime in A152471. A152472

Primes p such that p³-p²-1 and p³-p²+1 are prime. A160858