9091220018 has 16 divisors (see below), whose sum is σ = 13695023160. Its totient is φ = 4526247936.

The previous prime is 9091219967. The next prime is 9091220041. The reversal of 9091220018 is 8100221909.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9079612369 + 11607649 = 95287^2 + 3407^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 536930 + ... + 553602.

Almost surely, 2^9091220018 is an apocalyptic number.

9091220018 is a deficient number, since it is larger than the sum of its proper divisors (4603803142).

9091220018 is a wasteful number, since it uses less digits than its factorization.

9091220018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17821.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 9091220018 is about 95347.8894260382. The cubic root of 9091220018 is about 2087.0878160593.

The spelling of 9091220018 in words is "nine billion, ninety-one million, two hundred twenty thousand, eighteen".