13511891 has 8 divisors (see below), whose sum is σ = 13764960. Its totient is φ = 13261248.

The previous prime is 13511867. The next prime is 13511893. The reversal of 13511891 is 19811531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13511891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13511893) 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 7 ways as a sum of consecutive naturals, for example, 13490 + ... + 14456.

It is an arithmetic number, because the mean of its divisors is an integer number (1720620).

Almost surely, 2^13511891 is an apocalyptic number.

13511891 is a deficient number, since it is larger than the sum of its proper divisors (253069).

13511891 is an equidigital number, since it uses as much as digits as its factorization.

13511891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213.

The product of its digits is 1080, while the sum is 29.

The square root of 13511891 is about 3675.8524181474. The cubic root of 13511891 is about 238.1800475974.

The spelling of 13511891 in words is "thirteen million, five hundred eleven thousand, eight hundred ninety-one".