84820171 has 2 divisors, whose sum is σ = 84820172. Its totient is φ = 84820170.

The previous prime is 84820117. The next prime is 84820189. The reversal of 84820171 is 17102848.

Together with previous prime (84820117) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84820171 is a prime.

It is a super-2 number, since 2×84820171² = 14388922816938482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85820171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42410085 + 42410086.

It is an arithmetic number, because the mean of its divisors is an integer number (42410086).

Almost surely, 2^84820171 is an apocalyptic number.

84820171 is a deficient number, since it is larger than the sum of its proper divisors (1).

84820171 is an equidigital number, since it uses as much as digits as its factorization.

84820171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 84820171 is about 9209.7866967699. The cubic root of 84820171 is about 439.3726786925.

The spelling of 84820171 in words is "eighty-four million, eight hundred twenty thousand, one hundred seventy-one".