1121989121 has 8 divisors (see below), whose sum is σ = 1288408800. Its totient is φ = 966306240.

The previous prime is 1121989109. The next prime is 1121989157. The reversal of 1121989121 is 1219891211.

It is a happy number.

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 1121989121 - 2²² = 1117794817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121989181) 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, 2683976 + ... + 2684393.

It is an arithmetic number, because the mean of its divisors is an integer number (161051100).

Almost surely, 2^1121989121 is an apocalyptic number.

1121989121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121989121 is a deficient number, since it is larger than the sum of its proper divisors (166419679).

1121989121 is a wasteful number, since it uses less digits than its factorization.

1121989121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5368399.

The product of its digits is 2592, while the sum is 35.

The square root of 1121989121 is about 33496.1060572718. The cubic root of 1121989121 is about 1039.1132483828.

The spelling of 1121989121 in words is "one billion, one hundred twenty-one million, nine hundred eighty-nine thousand, one hundred twenty-one".