12616521 has 4 divisors (see below), whose sum is σ = 16822032. Its totient is φ = 8411012.

The previous prime is 12616511. The next prime is 12616523. The reversal of 12616521 is 12561621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12616521 - 2²² = 8422217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12616491 and 12616500.

It is not an unprimeable number, because it can be changed into a prime (12616523) 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, 2102751 + ... + 2102756.

It is an arithmetic number, because the mean of its divisors is an integer number (4205508).

Almost surely, 2^12616521 is an apocalyptic number.

It is an amenable number.

12616521 is a deficient number, since it is larger than the sum of its proper divisors (4205511).

12616521 is an equidigital number, since it uses as much as digits as its factorization.

12616521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4205510.

The product of its digits is 720, while the sum is 24.

The square root of 12616521 is about 3551.9742397715. The cubic root of 12616521 is about 232.7983359489.

The spelling of 12616521 in words is "twelve million, six hundred sixteen thousand, five hundred twenty-one".