13513813 has 2 divisors, whose sum is σ = 13513814. Its totient is φ = 13513812.

The previous prime is 13513789. The next prime is 13513847. The reversal of 13513813 is 31831531.

13513813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7273809 + 6240004 = 2697^2 + 2498^2 .

It is a cyclic number.

It is not a de Polignac number, because 13513813 - 2¹⁷ = 13382741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13513873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6756906 + 6756907.

It is an arithmetic number, because the mean of its divisors is an integer number (6756907).

Almost surely, 2^13513813 is an apocalyptic number.

It is an amenable number.

13513813 is a deficient number, since it is larger than the sum of its proper divisors (1).

13513813 is an equidigital number, since it uses as much as digits as its factorization.

13513813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 13513813 is about 3676.1138448095. The cubic root of 13513813 is about 238.1913403752.

The spelling of 13513813 in words is "thirteen million, five hundred thirteen thousand, eight hundred thirteen".