18115457 has 2 divisors, whose sum is σ = 18115458. Its totient is φ = 18115456.

The previous prime is 18115441. The next prime is 18115463. The reversal of 18115457 is 75451181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12503296 + 5612161 = 3536^2 + 2369^2 .

It is a cyclic number.

It is not a de Polignac number, because 18115457 - 2⁴ = 18115441 is a prime.

It is not a weakly prime, because it can be changed into another prime (18115477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9057728 + 9057729.

It is an arithmetic number, because the mean of its divisors is an integer number (9057729).

Almost surely, 2^18115457 is an apocalyptic number.

It is an amenable number.

18115457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18115457 is an equidigital number, since it uses as much as digits as its factorization.

18115457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 32.

The square root of 18115457 is about 4256.2256754077. The cubic root of 18115457 is about 262.6332843920.

The spelling of 18115457 in words is "eighteen million, one hundred fifteen thousand, four hundred fifty-seven".