842804681 has 2 divisors, whose sum is σ = 842804682. Its totient is φ = 842804680.

The previous prime is 842804647. The next prime is 842804689. The reversal of 842804681 is 186408248.

842804681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 600691081 + 242113600 = 24509^2 + 15560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842804681 is a prime.

It is a super-2 number, since 2×842804681² = 1420639460631023522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (842804689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421402340 + 421402341.

It is an arithmetic number, because the mean of its divisors is an integer number (421402341).

Almost surely, 2^842804681 is an apocalyptic number.

It is an amenable number.

842804681 is a deficient number, since it is larger than the sum of its proper divisors (1).

842804681 is an equidigital number, since it uses as much as digits as its factorization.

842804681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98304, while the sum is 41.

The square root of 842804681 is about 29031.0985152130. The cubic root of 842804681 is about 944.5877585665.

The spelling of 842804681 in words is "eight hundred forty-two million, eight hundred four thousand, six hundred eighty-one".