820734881 has 2 divisors, whose sum is σ = 820734882. Its totient is φ = 820734880.

The previous prime is 820734853. The next prime is 820734923. The reversal of 820734881 is 188437028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 537822481 + 282912400 = 23191^2 + 16820^2 .

It is a cyclic number.

It is not a de Polignac number, because 820734881 - 2¹⁰ = 820733857 is a prime.

It is a super-2 number, since 2×820734881² = 1347211489780168322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (820734841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410367440 + 410367441.

It is an arithmetic number, because the mean of its divisors is an integer number (410367441).

Almost surely, 2^820734881 is an apocalyptic number.

It is an amenable number.

820734881 is a deficient number, since it is larger than the sum of its proper divisors (1).

820734881 is an equidigital number, since it uses as much as digits as its factorization.

820734881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 820734881 is about 28648.4708317914. The cubic root of 820734881 is about 936.2696891468.

The spelling of 820734881 in words is "eight hundred twenty million, seven hundred thirty-four thousand, eight hundred eighty-one".