12345712731 has 12 divisors (see below), whose sum is σ = 19453850520. Its totient is φ = 7482250080.

The previous prime is 12345712693. The next prime is 12345712759. The reversal of 12345712731 is 13721754321.

12345712731 is a `hidden beast` number, since 1 + 2 + 34 + 571 + 27 + 31 = 666.

It is not a de Polignac number, because 12345712731 - 2⁹ = 12345712219 is a prime.

It is a super-2 number, since 2×12345712731² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12345712031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62351986 + ... + 62352183.

It is an arithmetic number, because the mean of its divisors is an integer number (1621154210).

Almost surely, 2^12345712731 is an apocalyptic number.

12345712731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12345712731 is a deficient number, since it is larger than the sum of its proper divisors (7108137789).

12345712731 is a wasteful number, since it uses less digits than its factorization.

12345712731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124704186 (or 124704183 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The spelling of 12345712731 in words is "twelve billion, three hundred forty-five million, seven hundred twelve thousand, seven hundred thirty-one".