855122217 has 32 divisors (see below), whose sum is σ = 1205280000. Its totient is φ = 538487040.

The previous prime is 855122173. The next prime is 855122251. The reversal of 855122217 is 712221558.

It is not a de Polignac number, because 855122217 - 2¹⁴ = 855105833 is a prime.

It is a super-3 number, since 3×855122217³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (855122297) 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 in 31 ways as a sum of consecutive naturals, for example, 1427284 + ... + 1427882.

It is an arithmetic number, because the mean of its divisors is an integer number (37665000).

Almost surely, 2^855122217 is an apocalyptic number.

855122217 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

855122217 is a deficient number, since it is larger than the sum of its proper divisors (350157783).

855122217 is a wasteful number, since it uses less digits than its factorization.

855122217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961.

The product of its digits is 11200, while the sum is 33.

The square root of 855122217 is about 29242.4728263531. The cubic root of 855122217 is about 949.1672173687.

The spelling of 855122217 in words is "eight hundred fifty-five million, one hundred twenty-two thousand, two hundred seventeen".