820831071 has 12 divisors (see below), whose sum is σ = 1110093656. Its totient is φ = 539503440.

The previous prime is 820831049. The next prime is 820831079. The reversal of 820831071 is 170138028.

It is a happy number.

It is not a de Polignac number, because 820831071 - 2⁶ = 820831007 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 (820831079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12016 + ... + 42261.

Almost surely, 2^820831071 is an apocalyptic number.

820831071 is a deficient number, since it is larger than the sum of its proper divisors (289262585).

820831071 is an equidigital number, since it uses as much as digits as its factorization.

820831071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54422 (or 54351 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 820831071 is about 28650.1495807614. The cubic root of 820831071 is about 936.3062646051.

Adding to 820831071 its reverse (170138028), we get a palindrome (990969099).

The spelling of 820831071 in words is "eight hundred twenty million, eight hundred thirty-one thousand, seventy-one".