18057257 has 2 divisors, whose sum is σ = 18057258. Its totient is φ = 18057256.

The previous prime is 18057253. The next prime is 18057289. The reversal of 18057257 is 75275081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15713296 + 2343961 = 3964^2 + 1531^2 .

It is a cyclic number.

It is not a de Polignac number, because 18057257 - 2² = 18057253 is a prime.

It is not a weakly prime, because it can be changed into another prime (18057251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9028628 + 9028629.

It is an arithmetic number, because the mean of its divisors is an integer number (9028629).

Almost surely, 2^18057257 is an apocalyptic number.

It is an amenable number.

18057257 is a deficient number, since it is larger than the sum of its proper divisors (1).

18057257 is an equidigital number, since it uses as much as digits as its factorization.

18057257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 18057257 is about 4249.3831317028. The cubic root of 18057257 is about 262.3517263916.

The spelling of 18057257 in words is "eighteen million, fifty-seven thousand, two hundred fifty-seven".