18135137 has 2 divisors, whose sum is σ = 18135138. Its totient is φ = 18135136.

The previous prime is 18135119. The next prime is 18135149. The reversal of 18135137 is 73153181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14258176 + 3876961 = 3776^2 + 1969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18135137 is a prime.

It is not a weakly prime, because it can be changed into another prime (18135167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9067568 + 9067569.

It is an arithmetic number, because the mean of its divisors is an integer number (9067569).

Almost surely, 2^18135137 is an apocalyptic number.

It is an amenable number.

18135137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18135137 is an equidigital number, since it uses as much as digits as its factorization.

18135137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 29.

The square root of 18135137 is about 4258.5369553404. The cubic root of 18135137 is about 262.7283551833.

The spelling of 18135137 in words is "eighteen million, one hundred thirty-five thousand, one hundred thirty-seven".