12715342781 has 4 divisors (see below), whose sum is σ = 13059000732. Its totient is φ = 12371684832.

The previous prime is 12715342771. The next prime is 12715342799. The reversal of 12715342781 is 18724351721.

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 5165296900 + 7550045881 = 71870^2 + 86891^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12715342781 is a prime.

It is a super-2 number, since 2×12715342781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12715342771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171828920 + ... + 171828993.

It is an arithmetic number, because the mean of its divisors is an integer number (3264750183).

Almost surely, 2^12715342781 is an apocalyptic number.

It is an amenable number.

12715342781 is a deficient number, since it is larger than the sum of its proper divisors (343657951).

12715342781 is an equidigital number, since it uses as much as digits as its factorization.

12715342781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343657950.

The product of its digits is 94080, while the sum is 41.

The spelling of 12715342781 in words is "twelve billion, seven hundred fifteen million, three hundred forty-two thousand, seven hundred eighty-one".