85281563 has 2 divisors, whose sum is σ = 85281564. Its totient is φ = 85281562.

The previous prime is 85281509. The next prime is 85281569. The reversal of 85281563 is 36518258.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85281563 - 2⁶ = 85281499 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85281569) 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, 42640781 + 42640782.

It is an arithmetic number, because the mean of its divisors is an integer number (42640782).

Almost surely, 2^85281563 is an apocalyptic number.

85281563 is a deficient number, since it is larger than the sum of its proper divisors (1).

85281563 is an equidigital number, since it uses as much as digits as its factorization.

85281563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 38.

The square root of 85281563 is about 9234.8017304109. The cubic root of 85281563 is about 440.1679162822.

The spelling of 85281563 in words is "eighty-five million, two hundred eighty-one thousand, five hundred sixty-three".