12521997 has 12 divisors (see below), whose sum is σ = 18711420. Its totient is φ = 8059968.

The previous prime is 12521989. The next prime is 12522011. The reversal of 12521997 is 79912521.

12521997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10634121 + 1887876 = 3261^2 + 1374^2 .

It is not a de Polignac number, because 12521997 - 2³ = 12521989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521797) 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, 23728 + ... + 24249.

It is an arithmetic number, because the mean of its divisors is an integer number (1559285).

Almost surely, 2^12521997 is an apocalyptic number.

It is an amenable number.

12521997 is a deficient number, since it is larger than the sum of its proper divisors (6189423).

12521997 is a wasteful number, since it uses less digits than its factorization.

12521997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48012 (or 48009 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 12521997 is about 3538.6433841234. The cubic root of 12521997 is about 232.2154966099.

It can be divided in two parts, 125219 and 97, that added together give a square (125316 = 354²).

The spelling of 12521997 in words is "twelve million, five hundred twenty-one thousand, nine hundred ninety-seven".