13889181 has 4 divisors (see below), whose sum is σ = 18518912. Its totient is φ = 9259452.

The previous prime is 13889179. The next prime is 13889189. The reversal of 13889181 is 18198831.

13889181 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13889181 - 2¹ = 13889179 is a prime.

It is a super-2 number, since 2×13889181² = 385818697701522, 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 (13889189) 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, 2314861 + ... + 2314866.

It is an arithmetic number, because the mean of its divisors is an integer number (4629728).

Almost surely, 2^13889181 is an apocalyptic number.

It is an amenable number.

13889181 is a deficient number, since it is larger than the sum of its proper divisors (4629731).

13889181 is an equidigital number, since it uses as much as digits as its factorization.

13889181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4629730.

The product of its digits is 13824, while the sum is 39.

The square root of 13889181 is about 3726.8191531117. The cubic root of 13889181 is about 240.3766135613.

The spelling of 13889181 in words is "thirteen million, eight hundred eighty-nine thousand, one hundred eighty-one".