13220791 has 4 divisors (see below), whose sum is σ = 13795632. Its totient is φ = 12645952.

The previous prime is 13220773. The next prime is 13220843. The reversal of 13220791 is 19702231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19702231 = 107 ⋅184133.

It is not a de Polignac number, because 13220791 - 2⁹ = 13220279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220731) 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, 287386 + ... + 287431.

It is an arithmetic number, because the mean of its divisors is an integer number (3448908).

Almost surely, 2^13220791 is an apocalyptic number.

13220791 is a deficient number, since it is larger than the sum of its proper divisors (574841).

13220791 is an equidigital number, since it uses as much as digits as its factorization.

13220791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574840.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 13220791 is about 3636.0405663304. The cubic root of 13220791 is about 236.4571658767.

The spelling of 13220791 in words is "thirteen million, two hundred twenty thousand, seven hundred ninety-one".