13891491 has 12 divisors (see below), whose sum is σ = 20406360. Its totient is φ = 9103680.

The previous prime is 13891483. The next prime is 13891513. The reversal of 13891491 is 19419831.

It is not a de Polignac number, because 13891491 - 2³ = 13891483 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (13898491) 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, 12550 + ... + 13611.

It is an arithmetic number, because the mean of its divisors is an integer number (1700530).

Almost surely, 2^13891491 is an apocalyptic number.

13891491 is a deficient number, since it is larger than the sum of its proper divisors (6514869).

13891491 is a wasteful number, since it uses less digits than its factorization.

13891491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26226 (or 26223 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 13891491 is about 3727.1290559893. The cubic root of 13891491 is about 240.3899390217.

The spelling of 13891491 in words is "thirteen million, eight hundred ninety-one thousand, four hundred ninety-one".