121293989 has 2 divisors, whose sum is σ = 121293990. Its totient is φ = 121293988.

The previous prime is 121293947. The next prime is 121294009. The reversal of 121293989 is 989392121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74822500 + 46471489 = 8650^2 + 6817^2 .

It is a cyclic number.

It is not a de Polignac number, because 121293989 - 2¹² = 121289893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121293089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60646994 + 60646995.

It is an arithmetic number, because the mean of its divisors is an integer number (60646995).

Almost surely, 2^121293989 is an apocalyptic number.

It is an amenable number.

121293989 is a deficient number, since it is larger than the sum of its proper divisors (1).

121293989 is an equidigital number, since it uses as much as digits as its factorization.

121293989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 121293989 is about 11013.3550292361. The cubic root of 121293989 is about 495.0089975578.

The spelling of 121293989 in words is "one hundred twenty-one million, two hundred ninety-three thousand, nine hundred eighty-nine".