12172115 has 4 divisors (see below), whose sum is σ = 14606544. Its totient is φ = 9737688.

The previous prime is 12172087. The next prime is 12172117. The reversal of 12172115 is 51127121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12172115 - 2¹² = 12168019 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 1217207 + ... + 1217216.

It is an arithmetic number, because the mean of its divisors is an integer number (3651636).

Almost surely, 2^12172115 is an apocalyptic number.

12172115 is a deficient number, since it is larger than the sum of its proper divisors (2434429).

12172115 is an equidigital number, since it uses as much as digits as its factorization.

12172115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434428.

The product of its digits is 140, while the sum is 20.

The square root of 12172115 is about 3488.8558296381. The cubic root of 12172115 is about 230.0322261083.

Adding to 12172115 its reverse (51127121), we get a palindrome (63299236).

The spelling of 12172115 in words is "twelve million, one hundred seventy-two thousand, one hundred fifteen".