85500109 has 2 divisors, whose sum is σ = 85500110. Its totient is φ = 85500108.

The previous prime is 85500073. The next prime is 85500113. The reversal of 85500109 is 90100558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58094884 + 27405225 = 7622^2 + 5235^2 .

It is a cyclic number.

It is not a de Polignac number, because 85500109 - 2⁹ = 85499597 is a prime.

It is a super-3 number, since 3×85500109³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85500119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42750054 + 42750055.

It is an arithmetic number, because the mean of its divisors is an integer number (42750055).

Almost surely, 2^85500109 is an apocalyptic number.

It is an amenable number.

85500109 is a deficient number, since it is larger than the sum of its proper divisors (1).

85500109 is an equidigital number, since it uses as much as digits as its factorization.

85500109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 85500109 is about 9246.6268984966. The cubic root of 85500109 is about 440.5435929549.

The spelling of 85500109 in words is "eighty-five million, five hundred thousand, one hundred nine".