85185109 has 4 divisors (see below), whose sum is σ = 86063404. Its totient is φ = 84306816.

The previous prime is 85185091. The next prime is 85185127. The reversal of 85185109 is 90158158.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (85185091) and next prime (85185127).

It can be written as a sum of positive squares in 2 ways, for example, as 47914084 + 37271025 = 6922^2 + 6105^2 .

It is a cyclic number.

It is not a de Polignac number, because 85185109 - 2¹⁷ = 85054037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85185409) 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 in 3 ways as a sum of consecutive naturals, for example, 439002 + ... + 439195.

It is an arithmetic number, because the mean of its divisors is an integer number (21515851).

Almost surely, 2^85185109 is an apocalyptic number.

It is an amenable number.

85185109 is a deficient number, since it is larger than the sum of its proper divisors (878295).

85185109 is an equidigital number, since it uses as much as digits as its factorization.

85185109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878294.

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 85185109 is about 9229.5779426797. The cubic root of 85185109 is about 440.0019094270.

The spelling of 85185109 in words is "eighty-five million, one hundred eighty-five thousand, one hundred nine".