18664031 has 2 divisors, whose sum is σ = 18664032. Its totient is φ = 18664030.

The previous prime is 18664007. The next prime is 18664039. The reversal of 18664031 is 13046681.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18664031 is a prime.

It is a super-2 number, since 2×18664031² = 696692106337922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18663985 and 18664003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18664039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9332015 + 9332016.

It is an arithmetic number, because the mean of its divisors is an integer number (9332016).

Almost surely, 2^18664031 is an apocalyptic number.

18664031 is a deficient number, since it is larger than the sum of its proper divisors (1).

18664031 is an equidigital number, since it uses as much as digits as its factorization.

18664031 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 29.

The square root of 18664031 is about 4320.1887690239. The cubic root of 18664031 is about 265.2579948573.

The spelling of 18664031 in words is "eighteen million, six hundred sixty-four thousand, thirty-one".