820751171 has 2 divisors, whose sum is σ = 820751172. Its totient is φ = 820751170.

The previous prime is 820751123. The next prime is 820751207. The reversal of 820751171 is 171157028.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820751171 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (820751101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410375585 + 410375586.

It is an arithmetic number, because the mean of its divisors is an integer number (410375586).

Almost surely, 2^820751171 is an apocalyptic number.

820751171 is a deficient number, since it is larger than the sum of its proper divisors (1).

820751171 is an equidigital number, since it uses as much as digits as its factorization.

820751171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 32.

The square root of 820751171 is about 28648.7551387490. The cubic root of 820751171 is about 936.2758834866.

The spelling of 820751171 in words is "eight hundred twenty million, seven hundred fifty-one thousand, one hundred seventy-one".