85186909 has 2 divisors, whose sum is σ = 85186910. Its totient is φ = 85186908.

The previous prime is 85186903. The next prime is 85186921. The reversal of 85186909 is 90968158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58094884 + 27092025 = 7622^2 + 5205^2 .

It is a cyclic number.

It is not a de Polignac number, because 85186909 - 2⁵ = 85186877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85186903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42593454 + 42593455.

It is an arithmetic number, because the mean of its divisors is an integer number (42593455).

Almost surely, 2^85186909 is an apocalyptic number.

It is an amenable number.

85186909 is a deficient number, since it is larger than the sum of its proper divisors (1).

85186909 is an equidigital number, since it uses as much as digits as its factorization.

85186909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 85186909 is about 9229.6754547492. The cubic root of 85186909 is about 440.0050085518.

The spelling of 85186909 in words is "eighty-five million, one hundred eighty-six thousand, nine hundred nine".