12313991 has 4 divisors (see below), whose sum is σ = 12343800. Its totient is φ = 12284184.

The previous prime is 12313937. The next prime is 12313999. The reversal of 12313991 is 19931321.

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 12313991 - 2⁶ = 12313927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12313999) 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, 14276 + ... + 15113.

It is an arithmetic number, because the mean of its divisors is an integer number (3085950).

Almost surely, 2^12313991 is an apocalyptic number.

12313991 is a deficient number, since it is larger than the sum of its proper divisors (29809).

12313991 is an equidigital number, since it uses as much as digits as its factorization.

12313991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29808.

The product of its digits is 1458, while the sum is 29.

The square root of 12313991 is about 3509.1296641760. The cubic root of 12313991 is about 230.9225141936.

The spelling of 12313991 in words is "twelve million, three hundred thirteen thousand, nine hundred ninety-one".