18081967 has 2 divisors, whose sum is σ = 18081968. Its totient is φ = 18081966.

The previous prime is 18081961. The next prime is 18081983. The reversal of 18081967 is 76918081.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18081967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18081961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9040983 + 9040984.

It is an arithmetic number, because the mean of its divisors is an integer number (9040984).

Almost surely, 2^18081967 is an apocalyptic number.

18081967 is a deficient number, since it is larger than the sum of its proper divisors (1).

18081967 is an equidigital number, since it uses as much as digits as its factorization.

18081967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 18081967 is about 4252.2896185467. The cubic root of 18081967 is about 262.4713413913.

The spelling of 18081967 in words is "eighteen million, eighty-one thousand, nine hundred sixty-seven".