820831079 has 2 divisors, whose sum is σ = 820831080. Its totient is φ = 820831078.

The previous prime is 820831049. The next prime is 820831117. The reversal of 820831079 is 970138028.

It is an a-pointer prime, because the next prime (820831117) can be obtained adding 820831079 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820831079 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820831019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410415539 + 410415540.

It is an arithmetic number, because the mean of its divisors is an integer number (410415540).

Almost surely, 2^820831079 is an apocalyptic number.

820831079 is a deficient number, since it is larger than the sum of its proper divisors (1).

820831079 is an equidigital number, since it uses as much as digits as its factorization.

820831079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 820831079 is about 28650.1497203767. The cubic root of 820831079 is about 936.3062676469.

The spelling of 820831079 in words is "eight hundred twenty million, eight hundred thirty-one thousand, seventy-nine".