13318991 has 8 divisors (see below), whose sum is σ = 15278880. Its totient is φ = 11373408.

The previous prime is 13318969. The next prime is 13319017. The reversal of 13318991 is 19981331.

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 13318991 - 2¹⁴ = 13302607 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 (13318951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1496 + ... + 5373.

It is an arithmetic number, because the mean of its divisors is an integer number (1909860).

Almost surely, 2^13318991 is an apocalyptic number.

13318991 is a deficient number, since it is larger than the sum of its proper divisors (1959889).

13318991 is an equidigital number, since it uses as much as digits as its factorization.

13318991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7153.

The product of its digits is 5832, while the sum is 35.

The square root of 13318991 is about 3649.5192834125. The cubic root of 13318991 is about 237.0411662129.

The spelling of 13318991 in words is "thirteen million, three hundred eighteen thousand, nine hundred ninety-one".