13139613 has 6 divisors (see below), whose sum is σ = 18979454. Its totient is φ = 8759736.

The previous prime is 13139611. The next prime is 13139617. The reversal of 13139613 is 31693131.

13139613 is a `hidden beast` number, since 13 + 1 + 39 + 613 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12659364 + 480249 = 3558^2 + 693^2 .

It is not a de Polignac number, because 13139613 - 2¹ = 13139611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13139611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 729970 + ... + 729987.

Almost surely, 2^13139613 is an apocalyptic number.

It is an amenable number.

13139613 is a deficient number, since it is larger than the sum of its proper divisors (5839841).

13139613 is a wasteful number, since it uses less digits than its factorization.

13139613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459963 (or 1459960 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 13139613 is about 3624.8604111055. The cubic root of 13139613 is about 235.9722089749.

The spelling of 13139613 in words is "thirteen million, one hundred thirty-nine thousand, six hundred thirteen".