18803231 has 2 divisors, whose sum is σ = 18803232. Its totient is φ = 18803230.

The previous prime is 18803227. The next prime is 18803261. The reversal of 18803231 is 13230881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18803231 - 2² = 18803227 is a prime.

It is a super-2 number, since 2×18803231² = 707122992078722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18803231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18803201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9401615 + 9401616.

It is an arithmetic number, because the mean of its divisors is an integer number (9401616).

Almost surely, 2^18803231 is an apocalyptic number.

18803231 is a deficient number, since it is larger than the sum of its proper divisors (1).

18803231 is an equidigital number, since it uses as much as digits as its factorization.

18803231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18803231 is about 4336.2692490204. The cubic root of 18803231 is about 265.9158108831.

The spelling of 18803231 in words is "eighteen million, eight hundred three thousand, two hundred thirty-one".