12312291 has 8 divisors (see below), whose sum is σ = 17130240. Its totient is φ = 7851272.

The previous prime is 12312283. The next prime is 12312331. The reversal of 12312291 is 19221321.

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

It is a cyclic number.

It is not a de Polignac number, because 12312291 - 2³ = 12312283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12312221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89151 + ... + 89288.

It is an arithmetic number, because the mean of its divisors is an integer number (2141280).

Almost surely, 2^12312291 is an apocalyptic number.

12312291 is a deficient number, since it is larger than the sum of its proper divisors (4817949).

12312291 is a wasteful number, since it uses less digits than its factorization.

12312291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178465.

The product of its digits is 216, while the sum is 21.

The square root of 12312291 is about 3508.8874305113. The cubic root of 12312291 is about 230.9118870855.

The spelling of 12312291 in words is "twelve million, three hundred twelve thousand, two hundred ninety-one".