121915553717 has 2 divisors, whose sum is σ = 121915553718. Its totient is φ = 121915553716.

The previous prime is 121915553701. The next prime is 121915553801. The reversal of 121915553717 is 717355519121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75952052836 + 45963500881 = 275594^2 + 214391^2 .

It is an emirp because it is prime and its reverse (717355519121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121915553717 - 2⁴ = 121915553701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121915558717) 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, 60957776858 + 60957776859.

It is an arithmetic number, because the mean of its divisors is an integer number (60957776859).

Almost surely, 2^121915553717 is an apocalyptic number.

It is an amenable number.

121915553717 is a deficient number, since it is larger than the sum of its proper divisors (1).

121915553717 is an equidigital number, since it uses as much as digits as its factorization.

121915553717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 330750, while the sum is 47.

The spelling of 121915553717 in words is "one hundred twenty-one billion, nine hundred fifteen million, five hundred fifty-three thousand, seven hundred seventeen".