121761231539 has 2 divisors, whose sum is σ = 121761231540. Its totient is φ = 121761231538.

The previous prime is 121761231509. The next prime is 121761231551. The reversal of 121761231539 is 935132167121.

It is a strong prime.

It is an emirp because it is prime and its reverse (935132167121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121761231539 - 2²⁰ = 121760182963 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121761231496 and 121761231505.

It is not a weakly prime, because it can be changed into another prime (121761231509) 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, 60880615769 + 60880615770.

It is an arithmetic number, because the mean of its divisors is an integer number (60880615770).

Almost surely, 2^121761231539 is an apocalyptic number.

121761231539 is a deficient number, since it is larger than the sum of its proper divisors (1).

121761231539 is an equidigital number, since it uses as much as digits as its factorization.

121761231539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 41.

The spelling of 121761231539 in words is "one hundred twenty-one billion, seven hundred sixty-one million, two hundred thirty-one thousand, five hundred thirty-nine".