643586093 has 4 divisors (see below), whose sum is σ = 643638528. Its totient is φ = 643533660.

The previous prime is 643586077. The next prime is 643586113. The reversal of 643586093 is 390685346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 643586093 - 2⁴ = 643586077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643586033) 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, 3188 + ... + 36018.

It is an arithmetic number, because the mean of its divisors is an integer number (160909632).

Almost surely, 2^643586093 is an apocalyptic number.

It is an amenable number.

643586093 is a deficient number, since it is larger than the sum of its proper divisors (52435).

643586093 is a wasteful number, since it uses less digits than its factorization.

643586093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52434.

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 643586093 is about 25368.9986597816. The cubic root of 643586093 is about 863.3804630168.

The spelling of 643586093 in words is "six hundred forty-three million, five hundred eighty-six thousand, ninety-three".