12515649 has 4 divisors (see below), whose sum is σ = 16687536. Its totient is φ = 8343764.

The previous prime is 12515647. The next prime is 12515651. The reversal of 12515649 is 94651521.

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 an interprime number because it is at equal distance from previous prime (12515647) and next prime (12515651).

It is a cyclic number.

It is not a de Polignac number, because 12515649 - 2¹ = 12515647 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12515647) 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, 2085939 + ... + 2085944.

It is an arithmetic number, because the mean of its divisors is an integer number (4171884).

Almost surely, 2^12515649 is an apocalyptic number.

It is an amenable number.

12515649 is a deficient number, since it is larger than the sum of its proper divisors (4171887).

12515649 is an equidigital number, since it uses as much as digits as its factorization.

12515649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4171886.

The product of its digits is 10800, while the sum is 33.

The square root of 12515649 is about 3537.7463165128. The cubic root of 12515649 is about 232.1762495915.

The spelling of 12515649 in words is "twelve million, five hundred fifteen thousand, six hundred forty-nine".