18093391 has 2 divisors, whose sum is σ = 18093392. Its totient is φ = 18093390.

The previous prime is 18093373. The next prime is 18093401. The reversal of 18093391 is 19339081.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18093391 is a prime.

It is equal to p_1156867 and since 18093391 and 1156867 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18093331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9046695 + 9046696.

It is an arithmetic number, because the mean of its divisors is an integer number (9046696).

Almost surely, 2^18093391 is an apocalyptic number.

18093391 is a deficient number, since it is larger than the sum of its proper divisors (1).

18093391 is an equidigital number, since it uses as much as digits as its factorization.

18093391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 18093391 is about 4253.6326827783. The cubic root of 18093391 is about 262.5266053155.

The spelling of 18093391 in words is "eighteen million, ninety-three thousand, three hundred ninety-one".