12625991 has 24 divisors (see below), whose sum is σ = 15713760. Its totient is φ = 9918720.

The previous prime is 12625981. The next prime is 12625993. The reversal of 12625991 is 19952621.

It is not a de Polignac number, because 12625991 - 2¹⁴ = 12609607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12625993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307931 + ... + 307971.

It is an arithmetic number, because the mean of its divisors is an integer number (654740).

Almost surely, 2^12625991 is an apocalyptic number.

12625991 is a deficient number, since it is larger than the sum of its proper divisors (3087769).

12625991 is an equidigital number, since it uses as much as digits as its factorization.

12625991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 114 counting only the distinct ones).

The product of its digits is 9720, while the sum is 35.

The square root of 12625991 is about 3553.3070511849. The cubic root of 12625991 is about 232.8565677673.

The spelling of 12625991 in words is "twelve million, six hundred twenty-five thousand, nine hundred ninety-one".