12740561 has 4 divisors (see below), whose sum is σ = 12775092. Its totient is φ = 12706032.

The previous prime is 12740549. The next prime is 12740573. The reversal of 12740561 is 16504721.

12740561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16504721 = 139 ⋅118739.

It is an interprime number because it is at equal distance from previous prime (12740549) and next prime (12740573).

It can be written as a sum of positive squares in 2 ways, for example, as 8410000 + 4330561 = 2900^2 + 2081^2 .

It is a cyclic number.

It is not a de Polignac number, because 12740561 - 2¹⁰ = 12739537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12740561.

It is not an unprimeable number, because it can be changed into a prime (12740591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16706 + ... + 17451.

It is an arithmetic number, because the mean of its divisors is an integer number (3193773).

Almost surely, 2^12740561 is an apocalyptic number.

It is an amenable number.

12740561 is a deficient number, since it is larger than the sum of its proper divisors (34531).

12740561 is an equidigital number, since it uses as much as digits as its factorization.

12740561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34530.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 12740561 is about 3569.3922451868. The cubic root of 12740561 is about 233.5587723675.

The spelling of 12740561 in words is "twelve million, seven hundred forty thousand, five hundred sixty-one".