12173991 has 8 divisors (see below), whose sum is σ = 16454640. Its totient is φ = 8004672.

The previous prime is 12173983. The next prime is 12174011. The reversal of 12173991 is 19937121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12173991 - 2³ = 12173983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12173951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27576 + ... + 28013.

It is an arithmetic number, because the mean of its divisors is an integer number (2056830).

Almost surely, 2^12173991 is an apocalyptic number.

12173991 is a deficient number, since it is larger than the sum of its proper divisors (4280649).

12173991 is an equidigital number, since it uses as much as digits as its factorization.

12173991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55665.

The product of its digits is 3402, while the sum is 33.

The square root of 12173991 is about 3489.1246753305. The cubic root of 12173991 is about 230.0440432353.

The spelling of 12173991 in words is "twelve million, one hundred seventy-three thousand, nine hundred ninety-one".