12172137 has 4 divisors (see below), whose sum is σ = 16229520. Its totient is φ = 8114756.

The previous prime is 12172133. The next prime is 12172151. The reversal of 12172137 is 73127121.

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 12172137 - 2² = 12172133 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12172133) 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, 2028687 + ... + 2028692.

It is an arithmetic number, because the mean of its divisors is an integer number (4057380).

Almost surely, 2^12172137 is an apocalyptic number.

It is an amenable number.

12172137 is a deficient number, since it is larger than the sum of its proper divisors (4057383).

12172137 is an equidigital number, since it uses as much as digits as its factorization.

12172137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4057382.

The product of its digits is 588, while the sum is 24.

The square root of 12172137 is about 3488.8589825328. The cubic root of 12172137 is about 230.0323646957.

Adding to 12172137 its reverse (73127121), we get a palindrome (85299258).

The spelling of 12172137 in words is "twelve million, one hundred seventy-two thousand, one hundred thirty-seven".