12381888731 has 4 divisors (see below), whose sum is σ = 12425641272. Its totient is φ = 12338136192.

The previous prime is 12381888721. The next prime is 12381888737. The reversal of 12381888731 is 13788818321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12381888731 is a prime.

It is a super-2 number, since 2×12381888731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12381888731.

It is not an unprimeable number, because it can be changed into a prime (12381888737) 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, 21875846 + ... + 21876411.

It is an arithmetic number, because the mean of its divisors is an integer number (3106410318).

Almost surely, 2^12381888731 is an apocalyptic number.

12381888731 is a deficient number, since it is larger than the sum of its proper divisors (43752541).

12381888731 is an equidigital number, since it uses as much as digits as its factorization.

12381888731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43752540.

The product of its digits is 516096, while the sum is 50.

The spelling of 12381888731 in words is "twelve billion, three hundred eighty-one million, eight hundred eighty-eight thousand, seven hundred thirty-one".