13021091 has 4 divisors (see below), whose sum is σ = 13028400. Its totient is φ = 13013784.

The previous prime is 13021079. The next prime is 13021117. The reversal of 13021091 is 19012031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13021091 - 2⁶ = 13021027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13021051) 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, 965 + ... + 5193.

It is an arithmetic number, because the mean of its divisors is an integer number (3257100).

Almost surely, 2^13021091 is an apocalyptic number.

13021091 is a deficient number, since it is larger than the sum of its proper divisors (7309).

13021091 is an equidigital number, since it uses as much as digits as its factorization.

13021091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7308.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 13021091 is about 3608.4748855992. The cubic root of 13021091 is about 235.2605590412.

The spelling of 13021091 in words is "thirteen million, twenty-one thousand, ninety-one".