84855817 has 2 divisors, whose sum is σ = 84855818. Its totient is φ = 84855816.

The previous prime is 84855803. The next prime is 84855839. The reversal of 84855817 is 71855848.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44036496 + 40819321 = 6636^2 + 6389^2 .

It is a cyclic number.

It is not a de Polignac number, because 84855817 - 2¹⁹ = 84331529 is a prime.

It is not a weakly prime, because it can be changed into another prime (84855847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42427908 + 42427909.

It is an arithmetic number, because the mean of its divisors is an integer number (42427909).

Almost surely, 2^84855817 is an apocalyptic number.

It is an amenable number.

84855817 is a deficient number, since it is larger than the sum of its proper divisors (1).

84855817 is an equidigital number, since it uses as much as digits as its factorization.

84855817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 358400, while the sum is 46.

The square root of 84855817 is about 9211.7217174641. The cubic root of 84855817 is about 439.4342194198.

It can be divided in two parts, 848 and 55817, that added together give a palindrome (56665).

The spelling of 84855817 in words is "eighty-four million, eight hundred fifty-five thousand, eight hundred seventeen".