121189789 has 16 divisors (see below), whose sum is σ = 142416000. Its totient is φ = 103078752.

The previous prime is 121189751. The next prime is 121189793. The reversal of 121189789 is 987981121.

It is not a de Polignac number, because 121189789 - 2⁷ = 121189661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121189589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45702 + ... + 48280.

It is an arithmetic number, because the mean of its divisors is an integer number (8901000).

Almost surely, 2^121189789 is an apocalyptic number.

It is an amenable number.

121189789 is a deficient number, since it is larger than the sum of its proper divisors (21226211).

121189789 is an equidigital number, since it uses as much as digits as its factorization.

121189789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737 (or 2723 counting only the distinct ones).

The product of its digits is 72576, while the sum is 46.

The square root of 121189789 is about 11008.6233925955. The cubic root of 121189789 is about 494.8672078580.

The spelling of 121189789 in words is "one hundred twenty-one million, one hundred eighty-nine thousand, seven hundred eighty-nine".