121113989 has 2 divisors, whose sum is σ = 121113990. Its totient is φ = 121113988.

The previous prime is 121113973. The next prime is 121113991. The reversal of 121113989 is 989311121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70845889 + 50268100 = 8417^2 + 7090^2 .

It is a cyclic number.

It is not a de Polignac number, because 121113989 - 2⁴ = 121113973 is a prime.

Together with 121113991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121113089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60556994 + 60556995.

It is an arithmetic number, because the mean of its divisors is an integer number (60556995).

Almost surely, 2^121113989 is an apocalyptic number.

It is an amenable number.

121113989 is a deficient number, since it is larger than the sum of its proper divisors (1).

121113989 is an equidigital number, since it uses as much as digits as its factorization.

121113989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 35.

The square root of 121113989 is about 11005.1800984809. The cubic root of 121113989 is about 494.7640122616.

The spelling of 121113989 in words is "one hundred twenty-one million, one hundred thirteen thousand, nine hundred eighty-nine".