18113957 has 2 divisors, whose sum is σ = 18113958. Its totient is φ = 18113956.

The previous prime is 18113939. The next prime is 18113971. The reversal of 18113957 is 75931181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17522596 + 591361 = 4186^2 + 769^2 .

It is an emirp because it is prime and its reverse (75931181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18113957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18113987) 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, 9056978 + 9056979.

It is an arithmetic number, because the mean of its divisors is an integer number (9056979).

Almost surely, 2^18113957 is an apocalyptic number.

It is an amenable number.

18113957 is a deficient number, since it is larger than the sum of its proper divisors (1).

18113957 is an equidigital number, since it uses as much as digits as its factorization.

18113957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 35.

The square root of 18113957 is about 4256.0494592991. The cubic root of 18113957 is about 262.6260353192.

The spelling of 18113957 in words is "eighteen million, one hundred thirteen thousand, nine hundred fifty-seven".