18540317 has 2 divisors, whose sum is σ = 18540318. Its totient is φ = 18540316.

The previous prime is 18540311. The next prime is 18540329. The reversal of 18540317 is 71304581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16434916 + 2105401 = 4054^2 + 1451^2 .

It is a cyclic number.

It is not a de Polignac number, because 18540317 - 2⁶ = 18540253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18540317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18540311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9270158 + 9270159.

It is an arithmetic number, because the mean of its divisors is an integer number (9270159).

Almost surely, 2^18540317 is an apocalyptic number.

It is an amenable number.

18540317 is a deficient number, since it is larger than the sum of its proper divisors (1).

18540317 is an equidigital number, since it uses as much as digits as its factorization.

18540317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 18540317 is about 4305.8468388924. The cubic root of 18540317 is about 264.6706100869.

Adding to 18540317 its reverse (71304581), we get a palindrome (89844898).

The spelling of 18540317 in words is "eighteen million, five hundred forty thousand, three hundred seventeen".