831886221 has 16 divisors (see below), whose sum is σ = 1119412800. Its totient is φ = 549494400.

The previous prime is 831886201. The next prime is 831886277. The reversal of 831886221 is 122688138.

831886221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 831886221 - 2⁶ = 831886157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 831886221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831886201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195921 + ... + 200121.

It is an arithmetic number, because the mean of its divisors is an integer number (69963300).

Almost surely, 2^831886221 is an apocalyptic number.

It is an amenable number.

831886221 is a deficient number, since it is larger than the sum of its proper divisors (287526579).

831886221 is a wasteful number, since it uses less digits than its factorization.

831886221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4796.

The product of its digits is 36864, while the sum is 39.

The square root of 831886221 is about 28842.4378477271. The cubic root of 831886221 is about 940.4909993342.

The spelling of 831886221 in words is "eight hundred thirty-one million, eight hundred eighty-six thousand, two hundred twenty-one".