831213 has 6 divisors (see below), whose sum is σ = 1200654. Its totient is φ = 554136.

The previous prime is 831191. The next prime is 831217. The reversal of 831213 is 312138.

It can be written as a sum of positive squares in only one way, i.e., 751689 + 79524 = 867^2 + 282^2 .

It is not a de Polignac number, because 831213 - 2⁸ = 830957 is a prime.

831213 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46170 + ... + 46187.

It is an arithmetic number, because the mean of its divisors is an integer number (200109).

2⁸³¹²¹³ is an apocalyptic number.

It is an amenable number.

831213 is a deficient number, since it is larger than the sum of its proper divisors (369441).

831213 is a wasteful number, since it uses less digits than its factorization.

831213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92363 (or 92360 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 831213 is about 911.7088351003. The cubic root of 831213 is about 94.0237226983.

It can be divided in two parts, 83 and 1213, that added together give a 4-th power (1296 = 6⁴).

The spelling of 831213 in words is "eight hundred thirty-one thousand, two hundred thirteen".