18315697 has 2 divisors, whose sum is σ = 18315698. Its totient is φ = 18315696.

The previous prime is 18315691. The next prime is 18315727. The reversal of 18315697 is 79651381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16128256 + 2187441 = 4016^2 + 1479^2 .

It is a cyclic number.

It is not a de Polignac number, because 18315697 - 2¹⁹ = 17791409 is a prime.

It is not a weakly prime, because it can be changed into another prime (18315691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9157848 + 9157849.

It is an arithmetic number, because the mean of its divisors is an integer number (9157849).

Almost surely, 2^18315697 is an apocalyptic number.

It is an amenable number.

18315697 is a deficient number, since it is larger than the sum of its proper divisors (1).

18315697 is an equidigital number, since it uses as much as digits as its factorization.

18315697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 18315697 is about 4279.6842173226. The cubic root of 18315697 is about 263.5974168929.

The spelling of 18315697 in words is "eighteen million, three hundred fifteen thousand, six hundred ninety-seven".