121715851 has 2 divisors, whose sum is σ = 121715852. Its totient is φ = 121715850.

The previous prime is 121715819. The next prime is 121715873. The reversal of 121715851 is 158517121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121715851 - 2⁵ = 121715819 is a prime.

It is not a weakly prime, because it can be changed into another prime (121715551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60857925 + 60857926.

It is an arithmetic number, because the mean of its divisors is an integer number (60857926).

Almost surely, 2^121715851 is an apocalyptic number.

121715851 is a deficient number, since it is larger than the sum of its proper divisors (1).

121715851 is an equidigital number, since it uses as much as digits as its factorization.

121715851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2800, while the sum is 31.

The square root of 121715851 is about 11032.4906979340. The cubic root of 121715851 is about 495.5822159971.

The spelling of 121715851 in words is "one hundred twenty-one million, seven hundred fifteen thousand, eight hundred fifty-one".