831693643 has 4 divisors (see below), whose sum is σ = 907302168. Its totient is φ = 756085120.

The previous prime is 831693619. The next prime is 831693671. The reversal of 831693643 is 346396138.

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-831693643 is a prime.

It is a super-2 number, since 2×831693643² = 1383428631613222898, which 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 831693643.

It is not an unprimeable number, because it can be changed into a prime (831693613) 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, 37804246 + ... + 37804267.

It is an arithmetic number, because the mean of its divisors is an integer number (226825542).

Almost surely, 2^831693643 is an apocalyptic number.

831693643 is a deficient number, since it is larger than the sum of its proper divisors (75608525).

831693643 is a wasteful number, since it uses less digits than its factorization.

831693643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75608524.

The product of its digits is 279936, while the sum is 43.

The square root of 831693643 is about 28839.0992057658. The cubic root of 831693643 is about 940.4184205572.

The spelling of 831693643 in words is "eight hundred thirty-one million, six hundred ninety-three thousand, six hundred forty-three".