18731890319 has 2 divisors, whose sum is σ = 18731890320. Its totient is φ = 18731890318.

The previous prime is 18731890277. The next prime is 18731890321. The reversal of 18731890319 is 91309813781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18731890319 - 2²⁴ = 18715113103 is a prime.

It is a super-2 number, since 2×18731890319² (a number of 21 digits) contains 22 as substring.

Together with 18731890321, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18731820319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9365945159 + 9365945160.

It is an arithmetic number, because the mean of its divisors is an integer number (9365945160).

Almost surely, 2^18731890319 is an apocalyptic number.

18731890319 is a deficient number, since it is larger than the sum of its proper divisors (1).

18731890319 is an equidigital number, since it uses as much as digits as its factorization.

18731890319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 50.

The spelling of 18731890319 in words is "eighteen billion, seven hundred thirty-one million, eight hundred ninety thousand, three hundred nineteen".