85145191 has 4 divisors (see below), whose sum is σ = 85527232. Its totient is φ = 84763152.

The previous prime is 85145183. The next prime is 85145209. The reversal of 85145191 is 19154158.

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 85145191 - 2³ = 85145183 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 (85140191) 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, 190686 + ... + 191131.

It is an arithmetic number, because the mean of its divisors is an integer number (21381808).

Almost surely, 2^85145191 is an apocalyptic number.

85145191 is a deficient number, since it is larger than the sum of its proper divisors (382041).

85145191 is a wasteful number, since it uses less digits than its factorization.

85145191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382040.

The product of its digits is 7200, while the sum is 34.

The square root of 85145191 is about 9227.4151851968. The cubic root of 85145191 is about 439.9331699464.

The spelling of 85145191 in words is "eighty-five million, one hundred forty-five thousand, one hundred ninety-one".