18430231 has 2 divisors, whose sum is σ = 18430232. Its totient is φ = 18430230.

The previous prime is 18430229. The next prime is 18430249. The reversal of 18430231 is 13203481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18430231 - 2¹ = 18430229 is a prime.

It is a super-2 number, since 2×18430231² = 679346829426722, which contains 22 as substring.

Together with 18430229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18430271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9215115 + 9215116.

It is an arithmetic number, because the mean of its divisors is an integer number (9215116).

Almost surely, 2^18430231 is an apocalyptic number.

18430231 is a deficient number, since it is larger than the sum of its proper divisors (1).

18430231 is an equidigital number, since it uses as much as digits as its factorization.

18430231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 18430231 is about 4293.0444908014. The cubic root of 18430231 is about 264.1457289622.

The spelling of 18430231 in words is "eighteen million, four hundred thirty thousand, two hundred thirty-one".