121989589 has 2 divisors, whose sum is σ = 121989590. Its totient is φ = 121989588.

The previous prime is 121989563. The next prime is 121989601. The reversal of 121989589 is 985989121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114383025 + 7606564 = 10695^2 + 2758^2 .

It is a cyclic number.

It is not a de Polignac number, because 121989589 - 2¹⁹ = 121465301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121989089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60994794 + 60994795.

It is an arithmetic number, because the mean of its divisors is an integer number (60994795).

Almost surely, 2^121989589 is an apocalyptic number.

It is an amenable number.

121989589 is a deficient number, since it is larger than the sum of its proper divisors (1).

121989589 is an equidigital number, since it uses as much as digits as its factorization.

121989589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 52.

The square root of 121989589 is about 11044.8897233064. The cubic root of 121989589 is about 495.9534580093.

The spelling of 121989589 in words is "one hundred twenty-one million, nine hundred eighty-nine thousand, five hundred eighty-nine".