18968231 has 2 divisors, whose sum is σ = 18968232. Its totient is φ = 18968230.

The previous prime is 18968221. The next prime is 18968317. The reversal of 18968231 is 13286981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18968231 is a prime.

It is a super-2 number, since 2×18968231² = 719587574538722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18968221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9484115 + 9484116.

It is an arithmetic number, because the mean of its divisors is an integer number (9484116).

Almost surely, 2^18968231 is an apocalyptic number.

18968231 is a deficient number, since it is larger than the sum of its proper divisors (1).

18968231 is an equidigital number, since it uses as much as digits as its factorization.

18968231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 18968231 is about 4355.2532647367. The cubic root of 18968231 is about 266.6913583039.

The spelling of 18968231 in words is "eighteen million, nine hundred sixty-eight thousand, two hundred thirty-one".