12741521 has 4 divisors (see below), whose sum is σ = 13721652. Its totient is φ = 11761392.

The previous prime is 12741511. The next prime is 12741523. The reversal of 12741521 is 12514721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7728400 + 5013121 = 2780^2 + 2239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12741521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12741523) 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 3 ways as a sum of consecutive naturals, for example, 490046 + ... + 490071.

It is an arithmetic number, because the mean of its divisors is an integer number (3430413).

Almost surely, 2^12741521 is an apocalyptic number.

It is an amenable number.

12741521 is a deficient number, since it is larger than the sum of its proper divisors (980131).

12741521 is an equidigital number, since it uses as much as digits as its factorization.

12741521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980130.

The product of its digits is 560, while the sum is 23.

The square root of 12741521 is about 3569.5267193285. The cubic root of 12741521 is about 233.5646384302.

The spelling of 12741521 in words is "twelve million, seven hundred forty-one thousand, five hundred twenty-one".