12813521 has 8 divisors (see below), whose sum is σ = 14669760. Its totient is φ = 10963728.

The previous prime is 12813517. The next prime is 12813523. The reversal of 12813521 is 12531821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12813521 - 2² = 12813517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12813523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3935 + ... + 6411.

It is an arithmetic number, because the mean of its divisors is an integer number (1833720).

Almost surely, 2^12813521 is an apocalyptic number.

It is an amenable number.

12813521 is a deficient number, since it is larger than the sum of its proper divisors (1856239).

12813521 is an equidigital number, since it uses as much as digits as its factorization.

12813521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223.

The product of its digits is 480, while the sum is 23.

The square root of 12813521 is about 3579.5978824443. The cubic root of 12813521 is about 234.0037559969.

The spelling of 12813521 in words is "twelve million, eight hundred thirteen thousand, five hundred twenty-one".