820682449 has 2 divisors, whose sum is σ = 820682450. Its totient is φ = 820682448.

The previous prime is 820682419. The next prime is 820682453. The reversal of 820682449 is 944286028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765075600 + 55606849 = 27660^2 + 7457^2 .

It is a cyclic number.

It is not a de Polignac number, because 820682449 - 2⁷ = 820682321 is a prime.

It is not a weakly prime, because it can be changed into another prime (820682419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410341224 + 410341225.

It is an arithmetic number, because the mean of its divisors is an integer number (410341225).

Almost surely, 2^820682449 is an apocalyptic number.

It is an amenable number.

820682449 is a deficient number, since it is larger than the sum of its proper divisors (1).

820682449 is an equidigital number, since it uses as much as digits as its factorization.

820682449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 820682449 is about 28647.5557247036. Note that the first 3 decimals coincide. The cubic root of 820682449 is about 936.2497511055.

The spelling of 820682449 in words is "eight hundred twenty million, six hundred eighty-two thousand, four hundred forty-nine".