56347831721 has 8 divisors (see below), whose sum is σ = 60694439424. Its totient is φ = 52159282560.

The previous prime is 56347831711. The next prime is 56347831723. The reversal of 56347831721 is 12713874365.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56347831721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56347831723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39513896 + ... + 39515321.

It is an arithmetic number, because the mean of its divisors is an integer number (7586804928).

Almost surely, 2^56347831721 is an apocalyptic number.

It is an amenable number.

56347831721 is a deficient number, since it is larger than the sum of its proper divisors (4346607703).

56347831721 is a wasteful number, since it uses less digits than its factorization.

56347831721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79029271.

The product of its digits is 846720, while the sum is 47.

The spelling of 56347831721 in words is "fifty-six billion, three hundred forty-seven million, eight hundred thirty-one thousand, seven hundred twenty-one".