18863231 has 2 divisors, whose sum is σ = 18863232. Its totient is φ = 18863230.

The previous prime is 18863227. The next prime is 18863263. The reversal of 18863231 is 13236881.

It is a happy number.

It is an a-pointer prime, because the next prime (18863263) can be obtained adding 18863231 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18863231 - 2² = 18863227 is a prime.

It is a super-2 number, since 2×18863231² = 711642967518722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18863291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9431615 + 9431616.

It is an arithmetic number, because the mean of its divisors is an integer number (9431616).

Almost surely, 2^18863231 is an apocalyptic number.

18863231 is a deficient number, since it is larger than the sum of its proper divisors (1).

18863231 is an equidigital number, since it uses as much as digits as its factorization.

18863231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 18863231 is about 4343.1821283478. The cubic root of 18863231 is about 266.1983511238.

The spelling of 18863231 in words is "eighteen million, eight hundred sixty-three thousand, two hundred thirty-one".