18068891 has 2 divisors, whose sum is σ = 18068892. Its totient is φ = 18068890.

The previous prime is 18068879. The next prime is 18068893. The reversal of 18068891 is 19886081.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18068891 is a prime.

Together with 18068893, 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 (18068893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9034445 + 9034446.

It is an arithmetic number, because the mean of its divisors is an integer number (9034446).

Almost surely, 2^18068891 is an apocalyptic number.

18068891 is a deficient number, since it is larger than the sum of its proper divisors (1).

18068891 is an equidigital number, since it uses as much as digits as its factorization.

18068891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 18068891 is about 4250.7518158556. The cubic root of 18068891 is about 262.4080572937.

The spelling of 18068891 in words is "eighteen million, sixty-eight thousand, eight hundred ninety-one".