13228691 has 8 divisors (see below), whose sum is σ = 15487584. Its totient is φ = 11062080.

The previous prime is 13228687. The next prime is 13228717. The reversal of 13228691 is 19682231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13228691 - 2² = 13228687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13228651) 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 7 ways as a sum of consecutive naturals, for example, 22760 + ... + 23333.

It is an arithmetic number, because the mean of its divisors is an integer number (1935948).

Almost surely, 2^13228691 is an apocalyptic number.

13228691 is a deficient number, since it is larger than the sum of its proper divisors (2258893).

13228691 is an equidigital number, since it uses as much as digits as its factorization.

13228691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46141.

The product of its digits is 5184, while the sum is 32.

The square root of 13228691 is about 3637.1267506096. The cubic root of 13228691 is about 236.5042543265.

The spelling of 13228691 in words is "thirteen million, two hundred twenty-eight thousand, six hundred ninety-one".