643083713 has 4 divisors (see below), whose sum is σ = 649713540. Its totient is φ = 636453888.

The previous prime is 643083697. The next prime is 643083719. The reversal of 643083713 is 317380346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 317380346 = 2 ⋅158690173.

It can be written as a sum of positive squares in 2 ways, for example, as 124701889 + 518381824 = 11167^2 + 22768^2 .

It is a cyclic number.

It is not a de Polignac number, because 643083713 - 2⁴ = 643083697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643083719) 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, 3314768 + ... + 3314961.

It is an arithmetic number, because the mean of its divisors is an integer number (162428385).

Almost surely, 2^643083713 is an apocalyptic number.

It is an amenable number.

643083713 is a deficient number, since it is larger than the sum of its proper divisors (6629827).

643083713 is an equidigital number, since it uses as much as digits as its factorization.

643083713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6629826.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 643083713 is about 25359.0952717166. The cubic root of 643083713 is about 863.1557544189.

The spelling of 643083713 in words is "six hundred forty-three million, eighty-three thousand, seven hundred thirteen".