13109391 has 16 divisors (see below), whose sum is σ = 19789920. Its totient is φ = 8573760.

The previous prime is 13109377. The next prime is 13109407. The reversal of 13109391 is 19390131.

It is not a de Polignac number, because 13109391 - 2⁷ = 13109263 is a prime.

It is a super-2 number, since 2×13109391² = 343712264781762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13109491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3150 + ... + 6011.

It is an arithmetic number, because the mean of its divisors is an integer number (1236870).

Almost surely, 2^13109391 is an apocalyptic number.

13109391 is a deficient number, since it is larger than the sum of its proper divisors (6680529).

13109391 is an equidigital number, since it uses as much as digits as its factorization.

13109391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9223 (or 9217 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 27.

The square root of 13109391 is about 3620.6892990148. The cubic root of 13109391 is about 235.7911527348.

It can be divided in two parts, 1310 and 9391, that added together give a palindrome (10701).

The spelling of 13109391 in words is "thirteen million, one hundred nine thousand, three hundred ninety-one".