12939181 has 4 divisors (see below), whose sum is σ = 12947200. Its totient is φ = 12931164.

The previous prime is 12939167. The next prime is 12939197. The reversal of 12939181 is 18193921.

12939181 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18193921 = 61 ⋅298261.

It is a cyclic number.

It is not a de Polignac number, because 12939181 - 2¹⁹ = 12414893 is a prime.

It is a super-3 number, since 3×12939181³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12939131) 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, 651 + ... + 5128.

It is an arithmetic number, because the mean of its divisors is an integer number (3236800).

Almost surely, 2^12939181 is an apocalyptic number.

It is an amenable number.

12939181 is a deficient number, since it is larger than the sum of its proper divisors (8019).

12939181 is an equidigital number, since it uses as much as digits as its factorization.

12939181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8018.

The product of its digits is 3888, while the sum is 34.

The square root of 12939181 is about 3597.1073100479. The cubic root of 12939181 is about 234.7662138544.

The spelling of 12939181 in words is "twelve million, nine hundred thirty-nine thousand, one hundred eighty-one".