820682869 has 2 divisors, whose sum is σ = 820682870. Its totient is φ = 820682868.

The previous prime is 820682867. The next prime is 820682881. The reversal of 820682869 is 968286028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 462035025 + 358647844 = 21495^2 + 18938^2 .

It is a cyclic number.

It is not a de Polignac number, because 820682869 - 2¹ = 820682867 is a prime.

It is a super-2 number, since 2×820682869² = 1347040742940142322, which contains 22 as substring.

Together with 820682867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820682867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410341434 + 410341435.

It is an arithmetic number, because the mean of its divisors is an integer number (410341435).

Almost surely, 2^820682869 is an apocalyptic number.

It is an amenable number.

820682869 is a deficient number, since it is larger than the sum of its proper divisors (1).

820682869 is an equidigital number, since it uses as much as digits as its factorization.

820682869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 663552, while the sum is 49.

The square root of 820682869 is about 28647.5630551710. The cubic root of 820682869 is about 936.2499108201.

The spelling of 820682869 in words is "eight hundred twenty million, six hundred eighty-two thousand, eight hundred sixty-nine".