18158137 has 2 divisors, whose sum is σ = 18158138. Its totient is φ = 18158136.

The previous prime is 18158113. The next prime is 18158191. The reversal of 18158137 is 73185181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13388281 + 4769856 = 3659^2 + 2184^2 .

It is an emirp because it is prime and its reverse (73185181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18158137 is a prime.

It is not a weakly prime, because it can be changed into another prime (18158197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9079068 + 9079069.

It is an arithmetic number, because the mean of its divisors is an integer number (9079069).

Almost surely, 2^18158137 is an apocalyptic number.

It is an amenable number.

18158137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18158137 is an equidigital number, since it uses as much as digits as its factorization.

18158137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 34.

The square root of 18158137 is about 4261.2365576203. The cubic root of 18158137 is about 262.8393772171.

The spelling of 18158137 in words is "eighteen million, one hundred fifty-eight thousand, one hundred thirty-seven".