121761536539 has 2 divisors, whose sum is σ = 121761536540. Its totient is φ = 121761536538.

The previous prime is 121761536521. The next prime is 121761536569. The reversal of 121761536539 is 935635167121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121761536539 - 2³⁵ = 87401798171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121761536492 and 121761536501.

It is not a weakly prime, because it can be changed into another prime (121761536569) 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, 60880768269 + 60880768270.

It is an arithmetic number, because the mean of its divisors is an integer number (60880768270).

Almost surely, 2^121761536539 is an apocalyptic number.

121761536539 is a deficient number, since it is larger than the sum of its proper divisors (1).

121761536539 is an equidigital number, since it uses as much as digits as its factorization.

121761536539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1020600, while the sum is 49.

The spelling of 121761536539 in words is "one hundred twenty-one billion, seven hundred sixty-one million, five hundred thirty-six thousand, five hundred thirty-nine".