121968889 has 6 divisors (see below), whose sum is σ = 141882234. Its totient is φ = 104544720.

The previous prime is 121968881. The next prime is 121968907. The reversal of 121968889 is 988869121.

It can be written as a sum of positive squares in only one way, i.e., 62678889 + 59290000 = 7917^2 + 7700^2 .

It is not a de Polignac number, because 121968889 - 2³ = 121968881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121968881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1244532 + ... + 1244629.

It is an arithmetic number, because the mean of its divisors is an integer number (23647039).

Almost surely, 2^121968889 is an apocalyptic number.

It is an amenable number.

121968889 is a deficient number, since it is larger than the sum of its proper divisors (19913345).

121968889 is an equidigital number, since it uses as much as digits as its factorization.

121968889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489175 (or 2489168 counting only the distinct ones).

The product of its digits is 497664, while the sum is 52.

The square root of 121968889 is about 11043.9525985944. The cubic root of 121968889 is about 495.9254042019.

The spelling of 121968889 in words is "one hundred twenty-one million, nine hundred sixty-eight thousand, eight hundred eighty-nine".