12751609 has 4 divisors (see below), whose sum is σ = 13732516. Its totient is φ = 11770704.

The previous prime is 12751601. The next prime is 12751639. The reversal of 12751609 is 90615721.

12751609 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: 90615721 = 7 ⋅12945103.

It can be written as a sum of positive squares in 2 ways, for example, as 7823209 + 4928400 = 2797^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 12751609 - 2³ = 12751601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12751601) 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, 490434 + ... + 490459.

It is an arithmetic number, because the mean of its divisors is an integer number (3433129).

Almost surely, 2^12751609 is an apocalyptic number.

It is an amenable number.

12751609 is a deficient number, since it is larger than the sum of its proper divisors (980907).

12751609 is an equidigital number, since it uses as much as digits as its factorization.

12751609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980906.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 12751609 is about 3570.9395122292. The cubic root of 12751609 is about 233.6262631638.

The spelling of 12751609 in words is "twelve million, seven hundred fifty-one thousand, six hundred nine".