12345681731 has 4 divisors (see below), whose sum is σ = 12414652200. Its totient is φ = 12276711264.

The previous prime is 12345681683. The next prime is 12345681739. The reversal of 12345681731 is 13718654321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12345681731 - 2¹⁰ = 12345680707 is a prime.

It is a super-2 number, since 2×12345681731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12345681739) 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, 34484966 + ... + 34485323.

It is an arithmetic number, because the mean of its divisors is an integer number (3103663050).

Almost surely, 2^12345681731 is an apocalyptic number.

12345681731 is a deficient number, since it is larger than the sum of its proper divisors (68970469).

12345681731 is an equidigital number, since it uses as much as digits as its factorization.

12345681731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68970468.

The product of its digits is 120960, while the sum is 41.

The spelling of 12345681731 in words is "twelve billion, three hundred forty-five million, six hundred eighty-one thousand, seven hundred thirty-one".