850565281 has 2 divisors, whose sum is σ = 850565282. Its totient is φ = 850565280.

The previous prime is 850565279. The next prime is 850565347. The reversal of 850565281 is 182565058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 819104400 + 31460881 = 28620^2 + 5609^2 .

It is a cyclic number.

It is not a de Polignac number, because 850565281 - 2¹ = 850565279 is a prime.

It is a super-2 number, since 2×850565281² = 1446922594485217922, which contains 22 as substring.

Together with 850565279, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (850565081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425282640 + 425282641.

It is an arithmetic number, because the mean of its divisors is an integer number (425282641).

Almost surely, 2^850565281 is an apocalyptic number.

It is an amenable number.

850565281 is a deficient number, since it is larger than the sum of its proper divisors (1).

850565281 is an equidigital number, since it uses as much as digits as its factorization.

850565281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96000, while the sum is 40.

The square root of 850565281 is about 29164.4523521358. The cubic root of 850565281 is about 947.4781799613.

The spelling of 850565281 in words is "eight hundred fifty million, five hundred sixty-five thousand, two hundred eighty-one".