13115491 has 12 divisors (see below), whose sum is σ = 14154912. Its totient is φ = 12145104.

The previous prime is 13115489. The next prime is 13115513. The reversal of 13115491 is 19451131.

It is not a de Polignac number, because 13115491 - 2¹ = 13115489 is a prime.

It is a super-2 number, since 2×13115491² = 344032208342162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13115471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16581 + ... + 17353.

It is an arithmetic number, because the mean of its divisors is an integer number (1179576).

Almost surely, 2^13115491 is an apocalyptic number.

13115491 is a deficient number, since it is larger than the sum of its proper divisors (1039421).

13115491 is an equidigital number, since it uses as much as digits as its factorization.

13115491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858 (or 839 counting only the distinct ones).

The product of its digits is 540, while the sum is 25.

The square root of 13115491 is about 3621.5315820796. The cubic root of 13115491 is about 235.8277194727.

The spelling of 13115491 in words is "thirteen million, one hundred fifteen thousand, four hundred ninety-one".