12751531609 has 2 divisors, whose sum is σ = 12751531610. Its totient is φ = 12751531608.

The previous prime is 12751531577. The next prime is 12751531657. The reversal of 12751531609 is 90613515721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11199565584 + 1551966025 = 105828^2 + 39395^2 .

It is a cyclic number.

It is not a de Polignac number, because 12751531609 - 2⁵ = 12751531577 is a prime.

It is a super-2 number, since 2×12751531609² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12751531699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6375765804 + 6375765805.

It is an arithmetic number, because the mean of its divisors is an integer number (6375765805).

Almost surely, 2^12751531609 is an apocalyptic number.

It is an amenable number.

12751531609 is a deficient number, since it is larger than the sum of its proper divisors (1).

12751531609 is an equidigital number, since it uses as much as digits as its factorization.

12751531609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 40.

The spelling of 12751531609 in words is "twelve billion, seven hundred fifty-one million, five hundred thirty-one thousand, six hundred nine".