13139569 has 4 divisors (see below), whose sum is σ = 13196196. Its totient is φ = 13082944.

The previous prime is 13139549. The next prime is 13139573. The reversal of 13139569 is 96593131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3610000 + 9529569 = 1900^2 + 3087^2 .

It is a cyclic number.

It is not a de Polignac number, because 13139569 - 2⁵ = 13139537 is a prime.

It is a super-2 number, since 2×13139569² = 345296547011522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13139519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27964 + ... + 28429.

It is an arithmetic number, because the mean of its divisors is an integer number (3299049).

Almost surely, 2^13139569 is an apocalyptic number.

It is an amenable number.

13139569 is a deficient number, since it is larger than the sum of its proper divisors (56627).

13139569 is an equidigital number, since it uses as much as digits as its factorization.

13139569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56626.

The product of its digits is 21870, while the sum is 37.

The square root of 13139569 is about 3624.8543419012. The cubic root of 13139569 is about 235.9719455783.

The spelling of 13139569 in words is "thirteen million, one hundred thirty-nine thousand, five hundred sixty-nine".