13328281 has 4 divisors (see below), whose sum is σ = 13579812. Its totient is φ = 13076752.

The previous prime is 13328279. The next prime is 13328309. The reversal of 13328281 is 18282331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4447881 + 8880400 = 2109^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 13328281 - 2¹ = 13328279 is a prime.

It is a super-2 number, since 2×13328281² = 355286148829922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13328261) 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, 125686 + ... + 125791.

It is an arithmetic number, because the mean of its divisors is an integer number (3394953).

Almost surely, 2^13328281 is an apocalyptic number.

It is an amenable number.

13328281 is a deficient number, since it is larger than the sum of its proper divisors (251531).

13328281 is an equidigital number, since it uses as much as digits as its factorization.

13328281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251530.

The product of its digits is 2304, while the sum is 28.

The square root of 13328281 is about 3650.7918319181. The cubic root of 13328281 is about 237.0962654978.

The spelling of 13328281 in words is "thirteen million, three hundred twenty-eight thousand, two hundred eighty-one".