13500521 has 4 divisors (see below), whose sum is σ = 13829844. Its totient is φ = 13171200.

The previous prime is 13500493. The next prime is 13500551. The reversal of 13500521 is 12500531.

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 287296 + 13213225 = 536^2 + 3635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13500521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13500521.

It is not an unprimeable number, because it can be changed into a prime (13500551) 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, 164600 + ... + 164681.

It is an arithmetic number, because the mean of its divisors is an integer number (3457461).

Almost surely, 2^13500521 is an apocalyptic number.

It is an amenable number.

13500521 is a deficient number, since it is larger than the sum of its proper divisors (329323).

13500521 is an equidigital number, since it uses as much as digits as its factorization.

13500521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329322.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 13500521 is about 3674.3055126105. The cubic root of 13500521 is about 238.1132208519.

The spelling of 13500521 in words is "thirteen million, five hundred thousand, five hundred twenty-one".