85255591 has 4 divisors (see below), whose sum is σ = 85368384. Its totient is φ = 85142800.

The previous prime is 85255589. The next prime is 85255619. The reversal of 85255591 is 19555258.

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

It is a cyclic number.

It is not a de Polignac number, because 85255591 - 2¹ = 85255589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85255091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55255 + ... + 56776.

It is an arithmetic number, because the mean of its divisors is an integer number (21342096).

Almost surely, 2^85255591 is an apocalyptic number.

85255591 is a deficient number, since it is larger than the sum of its proper divisors (112793).

85255591 is a wasteful number, since it uses less digits than its factorization.

85255591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112792.

The product of its digits is 90000, while the sum is 40.

The square root of 85255591 is about 9233.3954209706. The cubic root of 85255591 is about 440.1232282260.

The spelling of 85255591 in words is "eighty-five million, two hundred fifty-five thousand, five hundred ninety-one".