12774521 has 4 divisors (see below), whose sum is σ = 12802932. Its totient is φ = 12746112.

The previous prime is 12774491. The next prime is 12774523. The reversal of 12774521 is 12547721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12547721 = 179 ⋅70099.

It can be written as a sum of positive squares in 2 ways, for example, as 12075625 + 698896 = 3475^2 + 836^2 .

It is a cyclic number.

It is not a de Polignac number, because 12774521 - 2⁶ = 12774457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12774523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13520 + ... + 14433.

It is an arithmetic number, because the mean of its divisors is an integer number (3200733).

Almost surely, 2^12774521 is an apocalyptic number.

It is an amenable number.

12774521 is a deficient number, since it is larger than the sum of its proper divisors (28411).

12774521 is an equidigital number, since it uses as much as digits as its factorization.

12774521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28410.

The product of its digits is 3920, while the sum is 29.

The square root of 12774521 is about 3574.1461917499. The cubic root of 12774521 is about 233.7661054418.

The spelling of 12774521 in words is "twelve million, seven hundred seventy-four thousand, five hundred twenty-one".