122861227789 has 2 divisors, whose sum is σ = 122861227790. Its totient is φ = 122861227788.

The previous prime is 122861227781. The next prime is 122861227813. The reversal of 122861227789 is 987722168221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110279118889 + 12582108900 = 332083^2 + 112170^2 .

It is a cyclic number.

It is not a de Polignac number, because 122861227789 - 2³ = 122861227781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122861227781) 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, 61430613894 + 61430613895.

It is an arithmetic number, because the mean of its divisors is an integer number (61430613895).

Almost surely, 2^122861227789 is an apocalyptic number.

It is an amenable number.

122861227789 is a deficient number, since it is larger than the sum of its proper divisors (1).

122861227789 is an equidigital number, since it uses as much as digits as its factorization.

122861227789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 55.

The spelling of 122861227789 in words is "one hundred twenty-two billion, eight hundred sixty-one million, two hundred twenty-seven thousand, seven hundred eighty-nine".