18868231 has 2 divisors, whose sum is σ = 18868232. Its totient is φ = 18868230.

The previous prime is 18868229. The next prime is 18868279. The reversal of 18868231 is 13286881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18868231 - 2¹ = 18868229 is a prime.

It is a super-2 number, since 2×18868231² = 712020282138722, which contains 22 as substring.

Together with 18868229, 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 (18868831) 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, 9434115 + 9434116.

It is an arithmetic number, because the mean of its divisors is an integer number (9434116).

Almost surely, 2^18868231 is an apocalyptic number.

18868231 is a deficient number, since it is larger than the sum of its proper divisors (1).

18868231 is an equidigital number, since it uses as much as digits as its factorization.

18868231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The square root of 18868231 is about 4343.7577050291. The cubic root of 18868231 is about 266.2218690844.

The spelling of 18868231 in words is "eighteen million, eight hundred sixty-eight thousand, two hundred thirty-one".