85385561 has 4 divisors (see below), whose sum is σ = 85428900. Its totient is φ = 85342224.

The previous prime is 85385539. The next prime is 85385593. The reversal of 85385561 is 16558358.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5175625 + 80209936 = 2275^2 + 8956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85385561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85385761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18566 + ... + 22703.

It is an arithmetic number, because the mean of its divisors is an integer number (21357225).

Almost surely, 2^85385561 is an apocalyptic number.

It is an amenable number.

85385561 is a deficient number, since it is larger than the sum of its proper divisors (43339).

85385561 is a wasteful number, since it uses less digits than its factorization.

85385561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43338.

The product of its digits is 144000, while the sum is 41.

The square root of 85385561 is about 9240.4307800015. The cubic root of 85385561 is about 440.3467669281.

The spelling of 85385561 in words is "eighty-five million, three hundred eighty-five thousand, five hundred sixty-one".