1220989091 has 8 divisors (see below), whose sum is σ = 1408458240. Its totient is φ = 1036780488.

The previous prime is 1220989051. The next prime is 1220989093. The reversal of 1220989091 is 1909890221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220989091 - 2²⁶ = 1153880227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220989093) 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 7 ways as a sum of consecutive naturals, for example, 814331 + ... + 815828.

It is an arithmetic number, because the mean of its divisors is an integer number (176057280).

Almost surely, 2^1220989091 is an apocalyptic number.

1220989091 is a deficient number, since it is larger than the sum of its proper divisors (187469149).

1220989091 is a wasteful number, since it uses less digits than its factorization.

1220989091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630273.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 1220989091 is about 34942.6543210444. The cubic root of 1220989091 is about 1068.8184153005.

The spelling of 1220989091 in words is "one billion, two hundred twenty million, nine hundred eighty-nine thousand, ninety-one".