13520513 has 4 divisors (see below), whose sum is σ = 13573380. Its totient is φ = 13467648.

The previous prime is 13520509. The next prime is 13520531. The reversal of 13520513 is 31502531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31502531 = 43 ⋅732617.

It can be written as a sum of positive squares in 2 ways, for example, as 13126129 + 394384 = 3623^2 + 628^2 .

It is a cyclic number.

It is not a de Polignac number, because 13520513 - 2² = 13520509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13520813) 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, 26048 + ... + 26561.

It is an arithmetic number, because the mean of its divisors is an integer number (3393345).

Almost surely, 2^13520513 is an apocalyptic number.

It is an amenable number.

13520513 is a deficient number, since it is larger than the sum of its proper divisors (52867).

13520513 is an equidigital number, since it uses as much as digits as its factorization.

13520513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52866.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 13520513 is about 3677.0250203119. The cubic root of 13520513 is about 238.2306980880.

The spelling of 13520513 in words is "thirteen million, five hundred twenty thousand, five hundred thirteen".