18332257 has 2 divisors, whose sum is σ = 18332258. Its totient is φ = 18332256.

The previous prime is 18332243. The next prime is 18332267. The reversal of 18332257 is 75223381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13905441 + 4426816 = 3729^2 + 2104^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18332257 is a prime.

It is not a weakly prime, because it can be changed into another prime (18332267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9166128 + 9166129.

It is an arithmetic number, because the mean of its divisors is an integer number (9166129).

Almost surely, 2^18332257 is an apocalyptic number.

It is an amenable number.

18332257 is a deficient number, since it is larger than the sum of its proper divisors (1).

18332257 is an equidigital number, since it uses as much as digits as its factorization.

18332257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 18332257 is about 4281.6185023890. The cubic root of 18332257 is about 263.6768361711.

The spelling of 18332257 in words is "eighteen million, three hundred thirty-two thousand, two hundred fifty-seven".