18302231 has 2 divisors, whose sum is σ = 18302232. Its totient is φ = 18302230.

The previous prime is 18302203. The next prime is 18302233. The reversal of 18302231 is 13220381.

It is a strong prime.

It is an emirp because it is prime and its reverse (13220381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18302231 - 2¹⁰ = 18301207 is a prime.

It is a super-2 number, since 2×18302231² = 669943319154722, which contains 22 as substring.

Together with 18302233, 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 (18302233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9151115 + 9151116.

It is an arithmetic number, because the mean of its divisors is an integer number (9151116).

Almost surely, 2^18302231 is an apocalyptic number.

18302231 is a deficient number, since it is larger than the sum of its proper divisors (1).

18302231 is an equidigital number, since it uses as much as digits as its factorization.

18302231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 18302231 is about 4278.1106811302. The cubic root of 18302231 is about 263.5328006773.

The spelling of 18302231 in words is "eighteen million, three hundred two thousand, two hundred thirty-one".