13331491 has 4 divisors (see below), whose sum is σ = 13340752. Its totient is φ = 13322232.

The previous prime is 13331473. The next prime is 13331501. The reversal of 13331491 is 19413331.

13331491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13331491 - 2¹⁵ = 13298723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13331411) 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, 1956 + ... + 5521.

It is an arithmetic number, because the mean of its divisors is an integer number (3335188).

Almost surely, 2^13331491 is an apocalyptic number.

13331491 is a deficient number, since it is larger than the sum of its proper divisors (9261).

13331491 is an equidigital number, since it uses as much as digits as its factorization.

13331491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9260.

The product of its digits is 972, while the sum is 25.

The square root of 13331491 is about 3651.2314361048. The cubic root of 13331491 is about 237.1152981578.

The spelling of 13331491 in words is "thirteen million, three hundred thirty-one thousand, four hundred ninety-one".