18231137 has 2 divisors, whose sum is σ = 18231138. Its totient is φ = 18231136.

The previous prime is 18231119. The next prime is 18231151. The reversal of 18231137 is 73113281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10962721 + 7268416 = 3311^2 + 2696^2 .

It is a cyclic number.

It is not a de Polignac number, because 18231137 - 2¹⁶ = 18165601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18261137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9115568 + 9115569.

It is an arithmetic number, because the mean of its divisors is an integer number (9115569).

Almost surely, 2^18231137 is an apocalyptic number.

It is an amenable number.

18231137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18231137 is an equidigital number, since it uses as much as digits as its factorization.

18231137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 18231137 is about 4269.7935547284. The cubic root of 18231137 is about 263.1911317199.

The spelling of 18231137 in words is "eighteen million, two hundred thirty-one thousand, one hundred thirty-seven".