13147891 has 4 divisors (see below), whose sum is σ = 13314400. Its totient is φ = 12981384.

The previous prime is 13147861. The next prime is 13147949. The reversal of 13147891 is 19874131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19874131 = 31 ⋅641101.

It is a cyclic number.

It is not a de Polignac number, because 13147891 - 2⁵ = 13147859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13147831) 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, 83136 + ... + 83293.

It is an arithmetic number, because the mean of its divisors is an integer number (3328600).

Almost surely, 2^13147891 is an apocalyptic number.

13147891 is a deficient number, since it is larger than the sum of its proper divisors (166509).

13147891 is an equidigital number, since it uses as much as digits as its factorization.

13147891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166508.

The product of its digits is 6048, while the sum is 34.

The square root of 13147891 is about 3626.0020683943. The cubic root of 13147891 is about 236.0217529982.

The spelling of 13147891 in words is "thirteen million, one hundred forty-seven thousand, eight hundred ninety-one".