85309091 has 4 divisors (see below), whose sum is σ = 97496112. Its totient is φ = 73122072.

The previous prime is 85309057. The next prime is 85309099. The reversal of 85309091 is 19090358.

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 85309091 - 2⁶ = 85309027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85309099) 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, 6093500 + ... + 6093513.

It is an arithmetic number, because the mean of its divisors is an integer number (24374028).

Almost surely, 2^85309091 is an apocalyptic number.

85309091 is a deficient number, since it is larger than the sum of its proper divisors (12187021).

85309091 is a wasteful number, since it uses less digits than its factorization.

85309091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12187020.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 85309091 is about 9236.2920590462. The cubic root of 85309091 is about 440.2152717264.

The spelling of 85309091 in words is "eighty-five million, three hundred nine thousand, ninety-one".