121716191 has 2 divisors, whose sum is σ = 121716192. Its totient is φ = 121716190.

The previous prime is 121716181. The next prime is 121716239. The reversal of 121716191 is 191617121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121716191 - 2²⁶ = 54607327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121716121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60858095 + 60858096.

It is an arithmetic number, because the mean of its divisors is an integer number (60858096).

Almost surely, 2^121716191 is an apocalyptic number.

121716191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121716191 is an equidigital number, since it uses as much as digits as its factorization.

121716191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 29.

The square root of 121716191 is about 11032.5061069550. The cubic root of 121716191 is about 495.5826774484.

The spelling of 121716191 in words is "one hundred twenty-one million, seven hundred sixteen thousand, one hundred ninety-one".