13133281 has 4 divisors (see below), whose sum is σ = 15009472. Its totient is φ = 11257092.

The previous prime is 13133279. The next prime is 13133291. The reversal of 13133281 is 18233131.

13133281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18233131 = 7 ⋅2604733.

It is not a de Polignac number, because 13133281 - 2¹ = 13133279 is a prime.

It is a super-2 number, since 2×13133281² = 344966139649922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13133291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938085 + ... + 938098.

It is an arithmetic number, because the mean of its divisors is an integer number (3752368).

Almost surely, 2^13133281 is an apocalyptic number.

It is an amenable number.

13133281 is a deficient number, since it is larger than the sum of its proper divisors (1876191).

13133281 is an equidigital number, since it uses as much as digits as its factorization.

13133281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876190.

The product of its digits is 432, while the sum is 22.

The square root of 13133281 is about 3623.9868929123. The cubic root of 13133281 is about 235.9342977593.

The spelling of 13133281 in words is "thirteen million, one hundred thirty-three thousand, two hundred eighty-one".