18028931 has 2 divisors, whose sum is σ = 18028932. Its totient is φ = 18028930.

The previous prime is 18028921. The next prime is 18028939. The reversal of 18028931 is 13982081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18028931 - 2²² = 13834627 is a prime.

It is a super-2 number, since 2×18028931² = 650084706005522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18028939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9014465 + 9014466.

It is an arithmetic number, because the mean of its divisors is an integer number (9014466).

Almost surely, 2^18028931 is an apocalyptic number.

18028931 is a deficient number, since it is larger than the sum of its proper divisors (1).

18028931 is an equidigital number, since it uses as much as digits as its factorization.

18028931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 18028931 is about 4246.0488692430. The cubic root of 18028931 is about 262.2144729096.

The spelling of 18028931 in words is "eighteen million, twenty-eight thousand, nine hundred thirty-one".