13172391 has 6 divisors (see below), whose sum is σ = 19026800. Its totient is φ = 8781588.

The previous prime is 13172371. The next prime is 13172429. The reversal of 13172391 is 19327131.

It is not a de Polignac number, because 13172391 - 2⁵ = 13172359 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 (13172311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 731791 + ... + 731808.

Almost surely, 2^13172391 is an apocalyptic number.

13172391 is a deficient number, since it is larger than the sum of its proper divisors (5854409).

13172391 is a wasteful number, since it uses less digits than its factorization.

13172391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463605 (or 1463602 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 13172391 is about 3629.3788724794. The cubic root of 13172391 is about 236.1682643261.

The spelling of 13172391 in words is "thirteen million, one hundred seventy-two thousand, three hundred ninety-one".