1220511189 has 16 divisors (see below), whose sum is σ = 1745323200. Its totient is φ = 756302976.

The previous prime is 1220511179. The next prime is 1220511191. The reversal of 1220511189 is 9811150221.

It is not a de Polignac number, because 1220511189 - 2⁵ = 1220511157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220511179) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 198984 + ... + 205025.

It is an arithmetic number, because the mean of its divisors is an integer number (109082700).

Almost surely, 2^1220511189 is an apocalyptic number.

1220511189 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1220511189 is a deficient number, since it is larger than the sum of its proper divisors (524812011).

1220511189 is a wasteful number, since it uses less digits than its factorization.

1220511189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404084.

The product of its (nonzero) digits is 1440, while the sum is 30.

The square root of 1220511189 is about 34935.8152760172. The cubic root of 1220511189 is about 1068.6789499226.

The spelling of 1220511189 in words is "one billion, two hundred twenty million, five hundred eleven thousand, one hundred eighty-nine".