18115967 has 2 divisors, whose sum is σ = 18115968. Its totient is φ = 18115966.

The previous prime is 18115939. The next prime is 18115969. The reversal of 18115967 is 76951181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18115967 - 2¹² = 18111871 is a prime.

Together with 18115969, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18115967.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18115969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9057983 + 9057984.

It is an arithmetic number, because the mean of its divisors is an integer number (9057984).

Almost surely, 2^18115967 is an apocalyptic number.

18115967 is a deficient number, since it is larger than the sum of its proper divisors (1).

18115967 is an equidigital number, since it uses as much as digits as its factorization.

18115967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 38.

The square root of 18115967 is about 4256.2855872227. The cubic root of 18115967 is about 262.6357489856.

The spelling of 18115967 in words is "eighteen million, one hundred fifteen thousand, nine hundred sixty-seven".