816880171 has 2 divisors, whose sum is σ = 816880172. Its totient is φ = 816880170.

The previous prime is 816880139. The next prime is 816880199. The reversal of 816880171 is 171088618.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816880171 - 2⁵ = 816880139 is a prime.

It is not a weakly prime, because it can be changed into another prime (816880111) 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, 408440085 + 408440086.

It is an arithmetic number, because the mean of its divisors is an integer number (408440086).

Almost surely, 2^816880171 is an apocalyptic number.

816880171 is a deficient number, since it is larger than the sum of its proper divisors (1).

816880171 is an equidigital number, since it uses as much as digits as its factorization.

816880171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 40.

The square root of 816880171 is about 28581.1156360279. The cubic root of 816880171 is about 934.8016092753.

The spelling of 816880171 in words is "eight hundred sixteen million, eight hundred eighty thousand, one hundred seventy-one".