84820117 has 2 divisors, whose sum is σ = 84820118. Its totient is φ = 84820116.

The previous prime is 84820091. The next prime is 84820171. The reversal of 84820117 is 71102848.

Together with next prime (84820171) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79103236 + 5716881 = 8894^2 + 2391^2 .

It is a cyclic number.

It is not a de Polignac number, because 84820117 - 2⁷ = 84819989 is a prime.

It is a Chen prime.

It is equal to p_4933903 and since 84820117 and 4933903 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84821117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42410058 + 42410059.

It is an arithmetic number, because the mean of its divisors is an integer number (42410059).

Almost surely, 2^84820117 is an apocalyptic number.

It is an amenable number.

84820117 is a deficient number, since it is larger than the sum of its proper divisors (1).

84820117 is an equidigital number, since it uses as much as digits as its factorization.

84820117 is an evil number, because the sum of its binary digits is even.

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

The square root of 84820117 is about 9209.7837651055. The cubic root of 84820117 is about 439.3725854516.

The spelling of 84820117 in words is "eighty-four million, eight hundred twenty thousand, one hundred seventeen".