18333641 has 2 divisors, whose sum is σ = 18333642. Its totient is φ = 18333640.

The previous prime is 18333631. The next prime is 18333643. The reversal of 18333641 is 14633381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15840400 + 2493241 = 3980^2 + 1579^2 .

It is a cyclic number.

It is not a de Polignac number, because 18333641 - 2²² = 14139337 is a prime.

It is a super-2 number, since 2×18333641² = 672244784633762, which contains 22 as substring.

Together with 18333643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18333643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9166820 + 9166821.

It is an arithmetic number, because the mean of its divisors is an integer number (9166821).

Almost surely, 2^18333641 is an apocalyptic number.

It is an amenable number.

18333641 is a deficient number, since it is larger than the sum of its proper divisors (1).

18333641 is an equidigital number, since it uses as much as digits as its factorization.

18333641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 18333641 is about 4281.7801204639. The cubic root of 18333641 is about 263.6834714617.

The spelling of 18333641 in words is "eighteen million, three hundred thirty-three thousand, six hundred forty-one".