12745521 has 12 divisors (see below), whose sum is σ = 18546372. Its totient is φ = 8434176.

The previous prime is 12745483. The next prime is 12745541. The reversal of 12745521 is 12554721.

12745521 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 3381921 + 9363600 = 1839^2 + 3060^2 .

It is not a de Polignac number, because 12745521 - 2⁹ = 12745009 is a prime.

It is a super-2 number, since 2×12745521² = 324896611122882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12745541) 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, 3936 + ... + 6401.

It is an arithmetic number, because the mean of its divisors is an integer number (1545531).

Almost surely, 2^12745521 is an apocalyptic number.

It is an amenable number.

12745521 is a deficient number, since it is larger than the sum of its proper divisors (5800851).

12745521 is a wasteful number, since it uses less digits than its factorization.

12745521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10480 (or 10477 counting only the distinct ones).

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

The square root of 12745521 is about 3570.0869737305. The cubic root of 12745521 is about 233.5890771872.

The spelling of 12745521 in words is "twelve million, seven hundred forty-five thousand, five hundred twenty-one".