13139661 has 4 divisors (see below), whose sum is σ = 17519552. Its totient is φ = 8759772.

The previous prime is 13139653. The next prime is 13139677. The reversal of 13139661 is 16693131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13139661 - 2³ = 13139653 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 3 ways as a sum of consecutive naturals, for example, 2189941 + ... + 2189946.

It is an arithmetic number, because the mean of its divisors is an integer number (4379888).

Almost surely, 2^13139661 is an apocalyptic number.

It is an amenable number.

13139661 is a deficient number, since it is larger than the sum of its proper divisors (4379891).

13139661 is an equidigital number, since it uses as much as digits as its factorization.

13139661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379890.

The product of its digits is 2916, while the sum is 30.

The square root of 13139661 is about 3624.8670320441. The cubic root of 13139661 is about 235.9724963160.

The spelling of 13139661 in words is "thirteen million, one hundred thirty-nine thousand, six hundred sixty-one".