121443989 has 2 divisors, whose sum is σ = 121443990. Its totient is φ = 121443988.

The previous prime is 121443983. The next prime is 121444013. The reversal of 121443989 is 989344121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104387089 + 17056900 = 10217^2 + 4130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121443989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121443983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60721994 + 60721995.

It is an arithmetic number, because the mean of its divisors is an integer number (60721995).

Almost surely, 2^121443989 is an apocalyptic number.

It is an amenable number.

121443989 is a deficient number, since it is larger than the sum of its proper divisors (1).

121443989 is an equidigital number, since it uses as much as digits as its factorization.

121443989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 121443989 is about 11020.1628390873. The cubic root of 121443989 is about 495.2129668922.

The spelling of 121443989 in words is "one hundred twenty-one million, four hundred forty-three thousand, nine hundred eighty-nine".