85885609 has 2 divisors, whose sum is σ = 85885610. Its totient is φ = 85885608.

The previous prime is 85885607. The next prime is 85885627. The reversal of 85885609 is 90658858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46785600 + 39100009 = 6840^2 + 6253^2 .

It is a cyclic number.

It is not a de Polignac number, because 85885609 - 2¹ = 85885607 is a prime.

Together with 85885607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (85885601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42942804 + 42942805.

It is an arithmetic number, because the mean of its divisors is an integer number (42942805).

Almost surely, 2^85885609 is an apocalyptic number.

It is an amenable number.

85885609 is a deficient number, since it is larger than the sum of its proper divisors (1).

85885609 is an equidigital number, since it uses as much as digits as its factorization.

85885609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 49.

The square root of 85885609 is about 9267.4488938434. The cubic root of 85885609 is about 441.2047030358.

The spelling of 85885609 in words is "eighty-five million, eight hundred eighty-five thousand, six hundred nine".