831690193 has 4 divisors (see below), whose sum is σ = 831821220. Its totient is φ = 831559168.

The previous prime is 831690179. The next prime is 831690203. The reversal of 831690193 is 391096138.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 391096138 = 2 ⋅195548069.

It can be written as a sum of positive squares in 2 ways, for example, as 367373889 + 464316304 = 19167^2 + 21548^2 .

It is a cyclic number.

It is not a de Polignac number, because 831690193 - 2¹⁷ = 831559121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (831691193) 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, 55480 + ... + 68857.

It is an arithmetic number, because the mean of its divisors is an integer number (207955305).

Almost surely, 2^831690193 is an apocalyptic number.

It is an amenable number.

831690193 is a deficient number, since it is larger than the sum of its proper divisors (131027).

831690193 is a wasteful number, since it uses less digits than its factorization.

831690193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131026.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 831690193 is about 28839.0393910754. The cubic root of 831690193 is about 940.4171202194.

The spelling of 831690193 in words is "eight hundred thirty-one million, six hundred ninety thousand, one hundred ninety-three".