85305709 has 2 divisors, whose sum is σ = 85305710. Its totient is φ = 85305708.

The previous prime is 85305697. The next prime is 85305713. The reversal of 85305709 is 90750358.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81956809 + 3348900 = 9053^2 + 1830^2 .

It is a cyclic number.

It is not a de Polignac number, because 85305709 - 2⁷ = 85305581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85305739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42652854 + 42652855.

It is an arithmetic number, because the mean of its divisors is an integer number (42652855).

Almost surely, 2^85305709 is an apocalyptic number.

It is an amenable number.

85305709 is a deficient number, since it is larger than the sum of its proper divisors (1).

85305709 is an equidigital number, since it uses as much as digits as its factorization.

85305709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 85305709 is about 9236.1089751042. The cubic root of 85305709 is about 440.2094543404.

The spelling of 85305709 in words is "eighty-five million, three hundred five thousand, seven hundred nine".