18116537 has 2 divisors, whose sum is σ = 18116538. Its totient is φ = 18116536.

The previous prime is 18116533. The next prime is 18116587. The reversal of 18116537 is 73561181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15085456 + 3031081 = 3884^2 + 1741^2 .

It is a cyclic number.

It is not a de Polignac number, because 18116537 - 2² = 18116533 is a prime.

It is a Chen prime.

It is equal to p_1158269 and since 18116537 and 1158269 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18116531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9058268 + 9058269.

It is an arithmetic number, because the mean of its divisors is an integer number (9058269).

Almost surely, 2^18116537 is an apocalyptic number.

It is an amenable number.

18116537 is a deficient number, since it is larger than the sum of its proper divisors (1).

18116537 is an equidigital number, since it uses as much as digits as its factorization.

18116537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 32.

The square root of 18116537 is about 4256.3525464886. The cubic root of 18116537 is about 262.6385034766.

The spelling of 18116537 in words is "eighteen million, one hundred sixteen thousand, five hundred thirty-seven".