84005861 has 2 divisors, whose sum is σ = 84005862. Its totient is φ = 84005860.

The previous prime is 84005849. The next prime is 84005899. The reversal of 84005861 is 16850048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81180100 + 2825761 = 9010^2 + 1681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84005861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84005161) 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, 42002930 + 42002931.

It is an arithmetic number, because the mean of its divisors is an integer number (42002931).

Almost surely, 2^84005861 is an apocalyptic number.

It is an amenable number.

84005861 is a deficient number, since it is larger than the sum of its proper divisors (1).

84005861 is an equidigital number, since it uses as much as digits as its factorization.

84005861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 84005861 is about 9165.4711280981. The cubic root of 84005861 is about 437.9620996097.

The spelling of 84005861 in words is "eighty-four million, five thousand, eight hundred sixty-one".