18513713 has 2 divisors, whose sum is σ = 18513714. Its totient is φ = 18513712.

The previous prime is 18513709. The next prime is 18513739. The reversal of 18513713 is 31731581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10316944 + 8196769 = 3212^2 + 2863^2 .

It is a cyclic number.

It is not a de Polignac number, because 18513713 - 2² = 18513709 is a prime.

It is not a weakly prime, because it can be changed into another prime (18513743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9256856 + 9256857.

It is an arithmetic number, because the mean of its divisors is an integer number (9256857).

Almost surely, 2^18513713 is an apocalyptic number.

It is an amenable number.

18513713 is a deficient number, since it is larger than the sum of its proper divisors (1).

18513713 is an equidigital number, since it uses as much as digits as its factorization.

18513713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 29.

The square root of 18513713 is about 4302.7564420962. The cubic root of 18513713 is about 264.5439551594.

The spelling of 18513713 in words is "eighteen million, five hundred thirteen thousand, seven hundred thirteen".