1000220985 has 12 divisors (see below), whose sum is σ = 1733716452. Its totient is φ = 533451168.

The previous prime is 1000220927. The next prime is 1000220999. The reversal of 1000220985 is 5890220001.

It can be written as a sum of positive squares in 2 ways, for example, as 116704809 + 883516176 = 10803^2 + 29724^2 .

It is not a de Polignac number, because 1000220985 - 2¹³ = 1000212793 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11113522 + ... + 11113611.

It is an arithmetic number, because the mean of its divisors is an integer number (144476371).

Almost surely, 2^1000220985 is an apocalyptic number.

1000220985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1000220985 is a deficient number, since it is larger than the sum of its proper divisors (733495467).

1000220985 is a wasteful number, since it uses less digits than its factorization.

1000220985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22227144 (or 22227141 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1000220985 is about 31626.2704883140. The cubic root of 1000220985 is about 1000.0736562413.

Adding to 1000220985 its reverse (5890220001), we get a palindrome (6890440986).

The spelling of 1000220985 in words is "one billion, two hundred twenty thousand, nine hundred eighty-five".