13525813 has 6 divisors (see below), whose sum is σ = 15734166. Its totient is φ = 11593512.

The previous prime is 13525793. The next prime is 13525849. The reversal of 13525813 is 31852531.

It can be written as a sum of positive squares in only one way, i.e., 6853924 + 6671889 = 2618^2 + 2583^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13525813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13525913) 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 5 ways as a sum of consecutive naturals, for example, 137970 + ... + 138067.

It is an arithmetic number, because the mean of its divisors is an integer number (2622361).

Almost surely, 2^13525813 is an apocalyptic number.

It is an amenable number.

13525813 is a deficient number, since it is larger than the sum of its proper divisors (2208353).

13525813 is an equidigital number, since it uses as much as digits as its factorization.

13525813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276051 (or 276044 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 13525813 is about 3677.7456410143. The cubic root of 13525813 is about 238.2618225913.

The spelling of 13525813 in words is "thirteen million, five hundred twenty-five thousand, eight hundred thirteen".