122879999989 has 2 divisors, whose sum is σ = 122879999990. Its totient is φ = 122879999988.

The previous prime is 122879999987. The next prime is 122880000043. The reversal of 122879999989 is 989999978221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61984567089 + 60895432900 = 248967^2 + 246770^2 .

It is a cyclic number.

It is not a de Polignac number, because 122879999989 - 2¹ = 122879999987 is a prime.

Together with 122879999987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122879999987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61439999994 + 61439999995.

It is an arithmetic number, because the mean of its divisors is an integer number (61439999995).

Almost surely, 2^122879999989 is an apocalyptic number.

It is an amenable number.

122879999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

122879999989 is an equidigital number, since it uses as much as digits as its factorization.

122879999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952342272, while the sum is 82.

The spelling of 122879999989 in words is "one hundred twenty-two billion, eight hundred seventy-nine million, nine hundred ninety-nine thousand, nine hundred eighty-nine".