13139491 has 4 divisors (see below), whose sum is σ = 13146984. Its totient is φ = 13132000.

The previous prime is 13139471. The next prime is 13139519. The reversal of 13139491 is 19493131.

13139491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13139491 - 2⁵ = 13139459 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13139411) 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, 456 + ... + 5146.

It is an arithmetic number, because the mean of its divisors is an integer number (3286746).

Almost surely, 2^13139491 is an apocalyptic number.

13139491 is a deficient number, since it is larger than the sum of its proper divisors (7493).

13139491 is an equidigital number, since it uses as much as digits as its factorization.

13139491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7492.

The product of its digits is 2916, while the sum is 31.

The square root of 13139491 is about 3624.8435828322. The cubic root of 13139491 is about 235.9714786465.

The spelling of 13139491 in words is "thirteen million, one hundred thirty-nine thousand, four hundred ninety-one".