18982231 has 2 divisors, whose sum is σ = 18982232. Its totient is φ = 18982230.

The previous prime is 18982207. The next prime is 18982253. The reversal of 18982231 is 13228981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18982231 is a prime.

It is a super-2 number, since 2×18982231² = 720650187474722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18982331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9491115 + 9491116.

It is an arithmetic number, because the mean of its divisors is an integer number (9491116).

Almost surely, 2^18982231 is an apocalyptic number.

18982231 is a deficient number, since it is larger than the sum of its proper divisors (1).

18982231 is an equidigital number, since it uses as much as digits as its factorization.

18982231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 18982231 is about 4356.8602226833. The cubic root of 18982231 is about 266.7569550169.

The spelling of 18982231 in words is "eighteen million, nine hundred eighty-two thousand, two hundred thirty-one".