13399181 has 4 divisors (see below), whose sum is σ = 13419264. Its totient is φ = 13379100.

The previous prime is 13399171. The next prime is 13399193. The reversal of 13399181 is 18199331.

13399181 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13399181 - 2⁶ = 13399117 is a prime.

It is a super-2 number, since 2×13399181² = 359076102941522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13399121) 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, 9005 + ... + 10386.

It is an arithmetic number, because the mean of its divisors is an integer number (3354816).

Almost surely, 2^13399181 is an apocalyptic number.

It is an amenable number.

13399181 is a deficient number, since it is larger than the sum of its proper divisors (20083).

13399181 is an equidigital number, since it uses as much as digits as its factorization.

13399181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20082.

The product of its digits is 5832, while the sum is 35.

The square root of 13399181 is about 3660.4891749601. The cubic root of 13399181 is about 237.5159346649.

The spelling of 13399181 in words is "thirteen million, three hundred ninety-nine thousand, one hundred eighty-one".