12625721 has 4 divisors (see below), whose sum is σ = 12633600. Its totient is φ = 12617844.

The previous prime is 12625693. The next prime is 12625729. The reversal of 12625721 is 12752621.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12625721 - 2²² = 8431417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12625729) 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, 581 + ... + 5058.

It is an arithmetic number, because the mean of its divisors is an integer number (3158400).

Almost surely, 2^12625721 is an apocalyptic number.

It is an amenable number.

12625721 is a deficient number, since it is larger than the sum of its proper divisors (7879).

12625721 is an equidigital number, since it uses as much as digits as its factorization.

12625721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7878.

The product of its digits is 1680, while the sum is 26.

The square root of 12625721 is about 3553.2690582054. The cubic root of 12625721 is about 232.8549079182.

The spelling of 12625721 in words is "twelve million, six hundred twenty-five thousand, seven hundred twenty-one".