195085091 has 4 divisors (see below), whose sum is σ = 195113232. Its totient is φ = 195056952.

The previous prime is 195085061. The next prime is 195085147. The reversal of 195085091 is 190580591.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 195085091 - 2¹⁰ = 195084067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195085021) 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, 4490 + ... + 20256.

It is an arithmetic number, because the mean of its divisors is an integer number (48778308).

Almost surely, 2^195085091 is an apocalyptic number.

195085091 is a deficient number, since it is larger than the sum of its proper divisors (28141).

195085091 is a wasteful number, since it uses less digits than its factorization.

195085091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28140.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 195085091 is about 13967.2864580061. The cubic root of 195085091 is about 579.9733350801.

The spelling of 195085091 in words is "one hundred ninety-five million, eighty-five thousand, ninety-one".