12991425 has 12 divisors (see below), whose sum is σ = 21479280. Its totient is φ = 6928720.

The previous prime is 12991423. The next prime is 12991427. The reversal of 12991425 is 52419921.

12991425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12991423) and next prime (12991427).

It is not a de Polignac number, because 12991425 - 2¹ = 12991423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12991423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86535 + ... + 86684.

It is an arithmetic number, because the mean of its divisors is an integer number (1789940).

Almost surely, 2^12991425 is an apocalyptic number.

12991425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12991425 is a deficient number, since it is larger than the sum of its proper divisors (8487855).

12991425 is a wasteful number, since it uses less digits than its factorization.

12991425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173232 (or 173227 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 12991425 is about 3604.3619407601. The cubic root of 12991425 is about 235.0817581829.

The spelling of 12991425 in words is "twelve million, nine hundred ninety-one thousand, four hundred twenty-five".