85309787 has 2 divisors, whose sum is σ = 85309788. Its totient is φ = 85309786.

The previous prime is 85309769. The next prime is 85309813. The reversal of 85309787 is 78790358.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85309787 - 2¹⁸ = 85047643 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85309687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42654893 + 42654894.

It is an arithmetic number, because the mean of its divisors is an integer number (42654894).

Almost surely, 2^85309787 is an apocalyptic number.

85309787 is a deficient number, since it is larger than the sum of its proper divisors (1).

85309787 is an equidigital number, since it uses as much as digits as its factorization.

85309787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 85309787 is about 9236.3297364267. The cubic root of 85309787 is about 440.2164688985.

The spelling of 85309787 in words is "eighty-five million, three hundred nine thousand, seven hundred eighty-seven".