85989091 has 4 divisors (see below), whose sum is σ = 86295384. Its totient is φ = 85682800.

The previous prime is 85989067. The next prime is 85989139. The reversal of 85989091 is 19098958.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19098958 = 2 ⋅9549479.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85989091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85989061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152725 + ... + 153286.

It is an arithmetic number, because the mean of its divisors is an integer number (21573846).

Almost surely, 2^85989091 is an apocalyptic number.

85989091 is a deficient number, since it is larger than the sum of its proper divisors (306293).

85989091 is a wasteful number, since it uses less digits than its factorization.

85989091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306292.

The product of its (nonzero) digits is 233280, while the sum is 49.

The square root of 85989091 is about 9273.0303029808. The cubic root of 85989091 is about 441.3818317418.

It can be divided in two parts, 8598 and 9091, that added together give a square (17689 = 133²).

The spelling of 85989091 in words is "eighty-five million, nine hundred eighty-nine thousand, ninety-one".