1222985817 has 16 divisors (see below), whose sum is σ = 1821960000. Its totient is φ = 810765792.

The previous prime is 1222985791. The next prime is 1222985821. The reversal of 1222985817 is 7185892221.

It is not a de Polignac number, because 1222985817 - 2¹⁰ = 1222984793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1222985917) 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 15 ways as a sum of consecutive naturals, for example, 121692 + ... + 131357.

It is an arithmetic number, because the mean of its divisors is an integer number (113872500).

Almost surely, 2^1222985817 is an apocalyptic number.

It is an amenable number.

1222985817 is a deficient number, since it is larger than the sum of its proper divisors (598974183).

1222985817 is a wasteful number, since it uses less digits than its factorization.

1222985817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253237 (or 253231 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 1222985817 is about 34971.2141196156. The cubic root of 1222985817 is about 1069.4007233237.

The spelling of 1222985817 in words is "one billion, two hundred twenty-two million, nine hundred eighty-five thousand, eight hundred seventeen".