18157147 has 2 divisors, whose sum is σ = 18157148. Its totient is φ = 18157146.

The previous prime is 18157133. The next prime is 18157159. The reversal of 18157147 is 74175181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18157147 - 2⁷ = 18157019 is a prime.

It is not a weakly prime, because it can be changed into another prime (18157177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9078573 + 9078574.

It is an arithmetic number, because the mean of its divisors is an integer number (9078574).

Almost surely, 2^18157147 is an apocalyptic number.

18157147 is a deficient number, since it is larger than the sum of its proper divisors (1).

18157147 is an equidigital number, since it uses as much as digits as its factorization.

18157147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7840, while the sum is 34.

The square root of 18157147 is about 4261.1203925728. The cubic root of 18157147 is about 262.8346003741.

The spelling of 18157147 in words is "eighteen million, one hundred fifty-seven thousand, one hundred forty-seven".