13312491 has 4 divisors (see below), whose sum is σ = 17749992. Its totient is φ = 8874992.

The previous prime is 13312477. The next prime is 13312493. The reversal of 13312491 is 19421331.

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 13312491 - 2¹¹ = 13310443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13312493) 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 3 ways as a sum of consecutive naturals, for example, 2218746 + ... + 2218751.

It is an arithmetic number, because the mean of its divisors is an integer number (4437498).

Almost surely, 2^13312491 is an apocalyptic number.

13312491 is a deficient number, since it is larger than the sum of its proper divisors (4437501).

13312491 is an equidigital number, since it uses as much as digits as its factorization.

13312491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4437500.

The product of its digits is 648, while the sum is 24.

The square root of 13312491 is about 3648.6286464917. The cubic root of 13312491 is about 237.0025992700.

The spelling of 13312491 in words is "thirteen million, three hundred twelve thousand, four hundred ninety-one".