1220811889 has 8 divisors (see below), whose sum is σ = 1334357280. Its totient is φ = 1107693600.

The previous prime is 1220811863. The next prime is 1220811913. The reversal of 1220811889 is 9881180221.

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 1220811889 - 2¹³ = 1220803697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220841889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100779 + ... + 112240.

It is an arithmetic number, because the mean of its divisors is an integer number (166794660).

Almost surely, 2^1220811889 is an apocalyptic number.

It is an amenable number.

1220811889 is a deficient number, since it is larger than the sum of its proper divisors (113545391).

1220811889 is a wasteful number, since it uses less digits than its factorization.

1220811889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213551.

The product of its (nonzero) digits is 18432, while the sum is 40.

The square root of 1220811889 is about 34940.1186174289. The cubic root of 1220811889 is about 1068.7667069695.

The spelling of 1220811889 in words is "one billion, two hundred twenty million, eight hundred eleven thousand, eight hundred eighty-nine".