18136537 has 2 divisors, whose sum is σ = 18136538. Its totient is φ = 18136536.

The previous prime is 18136529. The next prime is 18136561. The reversal of 18136537 is 73563181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 65536 = 4251^2 + 256^2 .

It is a cyclic number.

It is not a de Polignac number, because 18136537 - 2³ = 18136529 is a prime.

It is not a weakly prime, because it can be changed into another prime (18136567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9068268 + 9068269.

It is an arithmetic number, because the mean of its divisors is an integer number (9068269).

Almost surely, 2^18136537 is an apocalyptic number.

It is an amenable number.

18136537 is a deficient number, since it is larger than the sum of its proper divisors (1).

18136537 is an equidigital number, since it uses as much as digits as its factorization.

18136537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 18136537 is about 4258.7013278698. The cubic root of 18136537 is about 262.7351157284.

The spelling of 18136537 in words is "eighteen million, one hundred thirty-six thousand, five hundred thirty-seven".