121917617 has 2 divisors, whose sum is σ = 121917618. Its totient is φ = 121917616.

The previous prime is 121917613. The next prime is 121917667. The reversal of 121917617 is 716719121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78304801 + 43612816 = 8849^2 + 6604^2 .

It is a cyclic number.

It is not a de Polignac number, because 121917617 - 2² = 121917613 is a prime.

It is not a weakly prime, because it can be changed into another prime (121917613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60958808 + 60958809.

It is an arithmetic number, because the mean of its divisors is an integer number (60958809).

Almost surely, 2^121917617 is an apocalyptic number.

It is an amenable number.

121917617 is a deficient number, since it is larger than the sum of its proper divisors (1).

121917617 is an equidigital number, since it uses as much as digits as its factorization.

121917617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 35.

The square root of 121917617 is about 11041.6310842194. The cubic root of 121917617 is about 495.8559038255.

The spelling of 121917617 in words is "one hundred twenty-one million, nine hundred seventeen thousand, six hundred seventeen".