13091491 has 4 divisors (see below), whose sum is σ = 14961712. Its totient is φ = 11221272.

The previous prime is 13091473. The next prime is 13091497. The reversal of 13091491 is 19419031.

It is a happy number.

13091491 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.

It is a cyclic number.

It is not a de Polignac number, because 13091491 - 2⁷ = 13091363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13091497) 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, 935100 + ... + 935113.

It is an arithmetic number, because the mean of its divisors is an integer number (3740428).

Almost surely, 2^13091491 is an apocalyptic number.

13091491 is a deficient number, since it is larger than the sum of its proper divisors (1870221).

13091491 is an equidigital number, since it uses as much as digits as its factorization.

13091491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870220.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 13091491 is about 3618.2165496277. The cubic root of 13091491 is about 235.6837848155.

The spelling of 13091491 in words is "thirteen million, ninety-one thousand, four hundred ninety-one".