12521745 has 12 divisors (see below), whose sum is σ = 21704436. Its totient is φ = 6678240.

The previous prime is 12521731. The next prime is 12521749. The reversal of 12521745 is 54712521.

It can be written as a sum of positive squares in 2 ways, for example, as 5803281 + 6718464 = 2409^2 + 2592^2 .

It is not a de Polignac number, because 12521745 - 2⁹ = 12521233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12521749) 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 11 ways as a sum of consecutive naturals, for example, 139086 + ... + 139175.

It is an arithmetic number, because the mean of its divisors is an integer number (1808703).

Almost surely, 2^12521745 is an apocalyptic number.

12521745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12521745 is a deficient number, since it is larger than the sum of its proper divisors (9182691).

12521745 is a wasteful number, since it uses less digits than its factorization.

12521745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278272 (or 278269 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 12521745 is about 3538.6077770784. The cubic root of 12521745 is about 232.2139388526.

The spelling of 12521745 in words is "twelve million, five hundred twenty-one thousand, seven hundred forty-five".