13091228 has 24 divisors (see below), whose sum is σ = 24240720. Its totient is φ = 6168960.

The previous prime is 13091219. The next prime is 13091237. The reversal of 13091228 is 82219031.

13091228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (13091219) and next prime (13091237).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 13091197 and 13091206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21050 + ... + 21662.

It is an arithmetic number, because the mean of its divisors is an integer number (1010030).

Almost surely, 2^13091228 is an apocalyptic number.

It is an amenable number.

13091228 is a deficient number, since it is larger than the sum of its proper divisors (11149492).

13091228 is a wasteful number, since it uses less digits than its factorization.

13091228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 915 counting only the distinct ones).

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

The square root of 13091228 is about 3618.1802055730. The cubic root of 13091228 is about 235.6822065575.

The spelling of 13091228 in words is "thirteen million, ninety-one thousand, two hundred twenty-eight".