18324557 has 2 divisors, whose sum is σ = 18324558. Its totient is φ = 18324556.

The previous prime is 18324547. The next prime is 18324563. The reversal of 18324557 is 75542381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16801801 + 1522756 = 4099^2 + 1234^2 .

It is a cyclic number.

It is not a de Polignac number, because 18324557 - 2⁴ = 18324541 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18324547) 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, 9162278 + 9162279.

It is an arithmetic number, because the mean of its divisors is an integer number (9162279).

Almost surely, 2^18324557 is an apocalyptic number.

It is an amenable number.

18324557 is a deficient number, since it is larger than the sum of its proper divisors (1).

18324557 is an equidigital number, since it uses as much as digits as its factorization.

18324557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 35.

The square root of 18324557 is about 4280.7192152721. The cubic root of 18324557 is about 263.6399140768.

It can be divided in two parts, 18324 and 557, that added together give a palindrome (18881).

The spelling of 18324557 in words is "eighteen million, three hundred twenty-four thousand, five hundred fifty-seven".