121765754729 has 2 divisors, whose sum is σ = 121765754730. Its totient is φ = 121765754728.

The previous prime is 121765754717. The next prime is 121765754731. The reversal of 121765754729 is 927457567121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120579090025 + 1186664704 = 347245^2 + 34448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121765754729 is a prime.

Together with 121765754731, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121765754749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60882877364 + 60882877365.

It is an arithmetic number, because the mean of its divisors is an integer number (60882877365).

Almost surely, 2^121765754729 is an apocalyptic number.

It is an amenable number.

121765754729 is a deficient number, since it is larger than the sum of its proper divisors (1).

121765754729 is an equidigital number, since it uses as much as digits as its factorization.

121765754729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7408800, while the sum is 56.

The spelling of 121765754729 in words is "one hundred twenty-one billion, seven hundred sixty-five million, seven hundred fifty-four thousand, seven hundred twenty-nine".