121297789 has 2 divisors, whose sum is σ = 121297790. Its totient is φ = 121297788.

The previous prime is 121297783. The next prime is 121297811. The reversal of 121297789 is 987792121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104960025 + 16337764 = 10245^2 + 4042^2 .

It is a cyclic number.

It is not a de Polignac number, because 121297789 - 2¹⁹ = 120773501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121297783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60648894 + 60648895.

It is an arithmetic number, because the mean of its divisors is an integer number (60648895).

Almost surely, 2^121297789 is an apocalyptic number.

It is an amenable number.

121297789 is a deficient number, since it is larger than the sum of its proper divisors (1).

121297789 is an equidigital number, since it uses as much as digits as its factorization.

121297789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 46.

The square root of 121297789 is about 11013.5275457049. The cubic root of 121297789 is about 495.0141668564.

The spelling of 121297789 in words is "one hundred twenty-one million, two hundred ninety-seven thousand, seven hundred eighty-nine".