85648109 has 2 divisors, whose sum is σ = 85648110. Its totient is φ = 85648108.

The previous prime is 85648103. The next prime is 85648127. The reversal of 85648109 is 90184658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85470025 + 178084 = 9245^2 + 422^2 .

It is a cyclic number.

It is not a de Polignac number, because 85648109 - 2⁴ = 85648093 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 (85648103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42824054 + 42824055.

It is an arithmetic number, because the mean of its divisors is an integer number (42824055).

Almost surely, 2^85648109 is an apocalyptic number.

It is an amenable number.

85648109 is a deficient number, since it is larger than the sum of its proper divisors (1).

85648109 is an equidigital number, since it uses as much as digits as its factorization.

85648109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 85648109 is about 9254.6263565851. The cubic root of 85648109 is about 440.7976388977.

The spelling of 85648109 in words is "eighty-five million, six hundred forty-eight thousand, one hundred nine".