85555999 has 4 divisors (see below), whose sum is σ = 85580064. Its totient is φ = 85531936.

The previous prime is 85555997. The next prime is 85556039. The reversal of 85555999 is 99955558.

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 85555999 - 2¹ = 85555997 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 (85555991) 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, 5527 + ... + 14200.

It is an arithmetic number, because the mean of its divisors is an integer number (21395016).

Almost surely, 2^85555999 is an apocalyptic number.

85555999 is a deficient number, since it is larger than the sum of its proper divisors (24065).

85555999 is a wasteful number, since it uses less digits than its factorization.

85555999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24064.

The product of its digits is 3645000, while the sum is 55.

The square root of 85555999 is about 9249.6485879194. The cubic root of 85555999 is about 440.6395640543.

The spelling of 85555999 in words is "eighty-five million, five hundred fifty-five thousand, nine hundred ninety-nine".