121579928069 has 2 divisors, whose sum is σ = 121579928070. Its totient is φ = 121579928068.

The previous prime is 121579928047. The next prime is 121579928089. The reversal of 121579928069 is 960829975121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101155802500 + 20424125569 = 318050^2 + 142913^2 .

It is a cyclic number.

It is not a de Polignac number, because 121579928069 - 2³² = 117284960773 is a prime.

It is a super-2 number, since 2×121579928069² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121579927999 and 121579928017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121579928009) 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, 60789964034 + 60789964035.

It is an arithmetic number, because the mean of its divisors is an integer number (60789964035).

Almost surely, 2^121579928069 is an apocalyptic number.

It is an amenable number.

121579928069 is a deficient number, since it is larger than the sum of its proper divisors (1).

121579928069 is an equidigital number, since it uses as much as digits as its factorization.

121579928069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4898880, while the sum is 59.

The spelling of 121579928069 in words is "one hundred twenty-one billion, five hundred seventy-nine million, nine hundred twenty-eight thousand, sixty-nine".