13249281 has 16 divisors (see below), whose sum is σ = 18115200. Its totient is φ = 8611200.

The previous prime is 13249267. The next prime is 13249283. The reversal of 13249281 is 18294231.

13249281 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 13249281 - 2⁷ = 13249153 is a prime.

It is a super-2 number, since 2×13249281² = 351086894033922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13249283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21820 + ... + 22418.

It is an arithmetic number, because the mean of its divisors is an integer number (1132200).

Almost surely, 2^13249281 is an apocalyptic number.

It is an amenable number.

13249281 is a deficient number, since it is larger than the sum of its proper divisors (4865919).

13249281 is a wasteful number, since it uses less digits than its factorization.

13249281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776.

The product of its digits is 3456, while the sum is 30.

The square root of 13249281 is about 3639.9561810549. The cubic root of 13249281 is about 236.6268942842.

It can be divided in two parts, 13249 and 281, that added together give a triangular number (13530 = T₁₆₄).

The spelling of 13249281 in words is "thirteen million, two hundred forty-nine thousand, two hundred eighty-one".