13521309 has 16 divisors (see below), whose sum is σ = 18972672. Its totient is φ = 8548848.

The previous prime is 13521283. The next prime is 13521323. The reversal of 13521309 is 90312531.

It is a happy number.

It is not a de Polignac number, because 13521309 - 2¹² = 13517213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521329) 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 15 ways as a sum of consecutive naturals, for example, 7992 + ... + 9534.

It is an arithmetic number, because the mean of its divisors is an integer number (1185792).

Almost surely, 2^13521309 is an apocalyptic number.

It is an amenable number.

13521309 is a deficient number, since it is larger than the sum of its proper divisors (5451363).

13521309 is a wasteful number, since it uses less digits than its factorization.

13521309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 13521309 is about 3677.1332583957. The cubic root of 13521309 is about 238.2353731551.

The spelling of 13521309 in words is "thirteen million, five hundred twenty-one thousand, three hundred nine".