13720613 has 2 divisors, whose sum is σ = 13720614. Its totient is φ = 13720612.

The previous prime is 13720591. The next prime is 13720633. The reversal of 13720613 is 31602731.

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., 11404129 + 2316484 = 3377^2 + 1522^2 .

It is a cyclic number.

It is not a de Polignac number, because 13720613 - 2¹² = 13716517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13720633) 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, 6860306 + 6860307.

It is an arithmetic number, because the mean of its divisors is an integer number (6860307).

Almost surely, 2^13720613 is an apocalyptic number.

It is an amenable number.

13720613 is a deficient number, since it is larger than the sum of its proper divisors (1).

13720613 is an equidigital number, since it uses as much as digits as its factorization.

13720613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 13720613 is about 3704.1345817883. The cubic root of 13720613 is about 239.4001978397.

The spelling of 13720613 in words is "thirteen million, seven hundred twenty thousand, six hundred thirteen".