12172113 has 28 divisors (see below), whose sum is σ = 18624720. Its totient is φ = 7949016.

The previous prime is 12172087. The next prime is 12172117. The reversal of 12172113 is 31127121.

It is a happy number.

It is not a de Polignac number, because 12172113 - 2⁵ = 12172081 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12172117) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 42870 + ... + 43152.

Almost surely, 2^12172113 is an apocalyptic number.

It is an amenable number.

12172113 is a deficient number, since it is larger than the sum of its proper divisors (6452607).

12172113 is an frugal number, since it uses more digits than its factorization.

12172113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 345 counting only the distinct ones).

The product of its digits is 84, while the sum is 18.

The square root of 12172113 is about 3488.8555430112. The cubic root of 12172113 is about 230.0322135094.

Adding to 12172113 its reverse (31127121), we get a palindrome (43299234).

The spelling of 12172113 in words is "twelve million, one hundred seventy-two thousand, one hundred thirteen".