12181172 has 6 divisors (see below), whose sum is σ = 21317058. Its totient is φ = 6090584.

The previous prime is 12181157. The next prime is 12181187. The reversal of 12181172 is 27118121.

It is an interprime number because it is at equal distance from previous prime (12181157) and next prime (12181187).

It can be written as a sum of positive squares in only one way, i.e., 12082576 + 98596 = 3476^2 + 314^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1522643 + ... + 1522650.

It is an arithmetic number, because the mean of its divisors is an integer number (3552843).

Almost surely, 2^12181172 is an apocalyptic number.

It is an amenable number.

12181172 is a deficient number, since it is larger than the sum of its proper divisors (9135886).

12181172 is a wasteful number, since it uses less digits than its factorization.

12181172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045297 (or 3045295 counting only the distinct ones).

The product of its digits is 224, while the sum is 23.

The square root of 12181172 is about 3490.1535782828. The cubic root of 12181172 is about 230.0892659174.

Adding to 12181172 its reverse (27118121), we get a palindrome (39299293).

The spelling of 12181172 in words is "twelve million, one hundred eighty-one thousand, one hundred seventy-two".