18113971 has 2 divisors, whose sum is σ = 18113972. Its totient is φ = 18113970.

The previous prime is 18113957. The next prime is 18113983. The reversal of 18113971 is 17931181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18113971 - 2⁵ = 18113939 is a prime.

It is not a weakly prime, because it can be changed into another prime (18113071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9056985 + 9056986.

It is an arithmetic number, because the mean of its divisors is an integer number (9056986).

Almost surely, 2^18113971 is an apocalyptic number.

18113971 is a deficient number, since it is larger than the sum of its proper divisors (1).

18113971 is an equidigital number, since it uses as much as digits as its factorization.

18113971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 31.

The square root of 18113971 is about 4256.0511040165. The cubic root of 18113971 is about 262.6261029790.

The spelling of 18113971 in words is "eighteen million, one hundred thirteen thousand, nine hundred seventy-one".