84859109 has 2 divisors, whose sum is σ = 84859110. Its totient is φ = 84859108.

The previous prime is 84859091. The next prime is 84859141. The reversal of 84859109 is 90195848.

Together with previous prime (84859091) 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., 49420900 + 35438209 = 7030^2 + 5953^2 .

It is a cyclic number.

It is not a de Polignac number, because 84859109 - 2⁸ = 84858853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84859109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84859609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42429554 + 42429555.

It is an arithmetic number, because the mean of its divisors is an integer number (42429555).

Almost surely, 2^84859109 is an apocalyptic number.

It is an amenable number.

84859109 is a deficient number, since it is larger than the sum of its proper divisors (1).

84859109 is an equidigital number, since it uses as much as digits as its factorization.

84859109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 84859109 is about 9211.9004011116. The cubic root of 84859109 is about 439.4399019952.

The spelling of 84859109 in words is "eighty-four million, eight hundred fifty-nine thousand, one hundred nine".