13611491 has 4 divisors (see below), whose sum is σ = 13664712. Its totient is φ = 13558272.

The previous prime is 13611487. The next prime is 13611497. The reversal of 13611491 is 19411631.

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 13611491 - 2² = 13611487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13611491.

It is not an unprimeable number, because it can be changed into a prime (13611497) 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, 26225 + ... + 26738.

It is an arithmetic number, because the mean of its divisors is an integer number (3416178).

Almost surely, 2^13611491 is an apocalyptic number.

13611491 is a deficient number, since it is larger than the sum of its proper divisors (53221).

13611491 is an equidigital number, since it uses as much as digits as its factorization.

13611491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53220.

The product of its digits is 648, while the sum is 26.

The square root of 13611491 is about 3689.3754213959. The cubic root of 13611491 is about 238.7638464965.

The spelling of 13611491 in words is "thirteen million, six hundred eleven thousand, four hundred ninety-one".