13228091 has 4 divisors (see below), whose sum is σ = 14006232. Its totient is φ = 12449952.

The previous prime is 13228069. The next prime is 13228097. The reversal of 13228091 is 19082231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19082231 = 7 ⋅2726033.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13228091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13228091.

It is not an unprimeable number, because it can be changed into a prime (13228097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389045 + ... + 389078.

It is an arithmetic number, because the mean of its divisors is an integer number (3501558).

Almost surely, 2^13228091 is an apocalyptic number.

13228091 is a deficient number, since it is larger than the sum of its proper divisors (778141).

13228091 is an equidigital number, since it uses as much as digits as its factorization.

13228091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778140.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 13228091 is about 3637.0442669838. The cubic root of 13228091 is about 236.5006786465.

The spelling of 13228091 in words is "thirteen million, two hundred twenty-eight thousand, ninety-one".