816917971 has 2 divisors, whose sum is σ = 816917972. Its totient is φ = 816917970.

The previous prime is 816917909. The next prime is 816918001. The reversal of 816917971 is 179719618.

816917971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816917971 - 2¹¹ = 816915923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (816917071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408458985 + 408458986.

It is an arithmetic number, because the mean of its divisors is an integer number (408458986).

Almost surely, 2^816917971 is an apocalyptic number.

816917971 is a deficient number, since it is larger than the sum of its proper divisors (1).

816917971 is an equidigital number, since it uses as much as digits as its factorization.

816917971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 49.

The square root of 816917971 is about 28581.7769041744. The cubic root of 816917971 is about 934.8160279367.

The spelling of 816917971 in words is "eight hundred sixteen million, nine hundred seventeen thousand, nine hundred seventy-one".