12181913 has 8 divisors (see below), whose sum is σ = 12432576. Its totient is φ = 11934000.

The previous prime is 12181909. The next prime is 12181919. The reversal of 12181913 is 31918121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12181913 - 2² = 12181909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12181919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9818 + ... + 10988.

It is an arithmetic number, because the mean of its divisors is an integer number (1554072).

Almost surely, 2^12181913 is an apocalyptic number.

It is an amenable number.

12181913 is a deficient number, since it is larger than the sum of its proper divisors (250663).

12181913 is a wasteful number, since it uses less digits than its factorization.

12181913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375.

The product of its digits is 432, while the sum is 26.

The square root of 12181913 is about 3490.2597324555. The cubic root of 12181913 is about 230.0939313877.

The spelling of 12181913 in words is "twelve million, one hundred eighty-one thousand, nine hundred thirteen".