121917613 has 2 divisors, whose sum is σ = 121917614. Its totient is φ = 121917612.

The previous prime is 121917563. The next prime is 121917617. The reversal of 121917613 is 316719121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105124009 + 16793604 = 10253^2 + 4098^2 .

It is a cyclic number.

It is not a de Polignac number, because 121917613 - 2²¹ = 119820461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121917617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60958806 + 60958807.

It is an arithmetic number, because the mean of its divisors is an integer number (60958807).

Almost surely, 2^121917613 is an apocalyptic number.

It is an amenable number.

121917613 is a deficient number, since it is larger than the sum of its proper divisors (1).

121917613 is an equidigital number, since it uses as much as digits as its factorization.

121917613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 31.

The square root of 121917613 is about 11041.6309030867. The cubic root of 121917613 is about 495.8558984026.

The spelling of 121917613 in words is "one hundred twenty-one million, nine hundred seventeen thousand, six hundred thirteen".