18685313 has 2 divisors, whose sum is σ = 18685314. Its totient is φ = 18685312.

The previous prime is 18685307. The next prime is 18685319. The reversal of 18685313 is 31358681.

It is a balanced prime because it is at equal distance from previous prime (18685307) and next prime (18685319).

It can be written as a sum of positive squares in only one way, i.e., 16459249 + 2226064 = 4057^2 + 1492^2 .

It is a cyclic number.

It is not a de Polignac number, because 18685313 - 2¹⁴ = 18668929 is a prime.

It is not a weakly prime, because it can be changed into another prime (18685319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9342656 + 9342657.

It is an arithmetic number, because the mean of its divisors is an integer number (9342657).

Almost surely, 2^18685313 is an apocalyptic number.

It is an amenable number.

18685313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18685313 is an equidigital number, since it uses as much as digits as its factorization.

18685313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 18685313 is about 4322.6511540951. The cubic root of 18685313 is about 265.3587783075.

The spelling of 18685313 in words is "eighteen million, six hundred eighty-five thousand, three hundred thirteen".