18131297 has 2 divisors, whose sum is σ = 18131298. Its totient is φ = 18131296.

The previous prime is 18131273. The next prime is 18131303. The reversal of 18131297 is 79213181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9928801 + 8202496 = 3151^2 + 2864^2 .

It is a cyclic number.

It is not a de Polignac number, because 18131297 - 2⁶ = 18131233 is a prime.

It is not a weakly prime, because it can be changed into another prime (18131227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9065648 + 9065649.

It is an arithmetic number, because the mean of its divisors is an integer number (9065649).

Almost surely, 2^18131297 is an apocalyptic number.

It is an amenable number.

18131297 is a deficient number, since it is larger than the sum of its proper divisors (1).

18131297 is an equidigital number, since it uses as much as digits as its factorization.

18131297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 32.

The square root of 18131297 is about 4258.0860724039. The cubic root of 18131297 is about 262.7098101878.

The spelling of 18131297 in words is "eighteen million, one hundred thirty-one thousand, two hundred ninety-seven".