13195891 has 4 divisors (see below), whose sum is σ = 13517784. Its totient is φ = 12874000.

The previous prime is 13195877. The next prime is 13195913. The reversal of 13195891 is 19859131.

It is a happy number.

13195891 is digitally balanced in base 3, 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 an emirpimes, since its reverse is a distinct semiprime: 19859131 = 397 ⋅50023.

It is a de Polignac number, because none of the positive numbers 2^k-13195891 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13195891.

It is not an unprimeable number, because it can be changed into a prime (13195811) 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, 160885 + ... + 160966.

It is an arithmetic number, because the mean of its divisors is an integer number (3379446).

Almost surely, 2^13195891 is an apocalyptic number.

13195891 is a deficient number, since it is larger than the sum of its proper divisors (321893).

13195891 is an equidigital number, since it uses as much as digits as its factorization.

13195891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321892.

The product of its digits is 9720, while the sum is 37.

The square root of 13195891 is about 3632.6148983893. The cubic root of 13195891 is about 236.3086250002.

The spelling of 13195891 in words is "thirteen million, one hundred ninety-five thousand, eight hundred ninety-one".