12181928917 has 4 divisors (see below), whose sum is σ = 12182216320. Its totient is φ = 12181641516.

The previous prime is 12181928903. The next prime is 12181928923. The reversal of 12181928917 is 71982918121.

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 12181928917 - 2³¹ = 10034445269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12181928977) 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, 66183 + ... + 169540.

It is an arithmetic number, because the mean of its divisors is an integer number (3045554080).

Almost surely, 2^12181928917 is an apocalyptic number.

It is an amenable number.

12181928917 is a deficient number, since it is larger than the sum of its proper divisors (287403).

12181928917 is an equidigital number, since it uses as much as digits as its factorization.

12181928917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287402.

The product of its digits is 145152, while the sum is 49.

The spelling of 12181928917 in words is "twelve billion, one hundred eighty-one million, nine hundred twenty-eight thousand, nine hundred seventeen".