13227991 has 12 divisors (see below), whose sum is σ = 15447000. Its totient is φ = 11294640.

The previous prime is 13227983. The next prime is 13228001. The reversal of 13227991 is 19972231.

It is a happy number.

13227991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13227991 - 2³ = 13227983 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 (13227901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24181 + ... + 24721.

It is an arithmetic number, because the mean of its divisors is an integer number (1287250).

Almost surely, 2^13227991 is an apocalyptic number.

13227991 is a deficient number, since it is larger than the sum of its proper divisors (2219009).

13227991 is an equidigital number, since it uses as much as digits as its factorization.

13227991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054 (or 1047 counting only the distinct ones).

The product of its digits is 6804, while the sum is 34.

The square root of 13227991 is about 3637.0305195310. The cubic root of 13227991 is about 236.5000826893.

The spelling of 13227991 in words is "thirteen million, two hundred twenty-seven thousand, nine hundred ninety-one".