199471165 has 4 divisors (see below), whose sum is σ = 239365404. Its totient is φ = 159576928.

The previous prime is 199471147. The next prime is 199471187. The reversal of 199471165 is 561174991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77633721 + 121837444 = 8811^2 + 11038^2 .

It is a cyclic number.

It is not a de Polignac number, because 199471165 - 2⁵ = 199471133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19947112 + ... + 19947121.

It is an arithmetic number, because the mean of its divisors is an integer number (59841351).

Almost surely, 2^199471165 is an apocalyptic number.

It is an amenable number.

199471165 is a deficient number, since it is larger than the sum of its proper divisors (39894239).

199471165 is an equidigital number, since it uses as much as digits as its factorization.

199471165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39894238.

The product of its digits is 68040, while the sum is 43.

The square root of 199471165 is about 14123.4261070039. The cubic root of 199471165 is about 584.2876516951.

It can be divided in two parts, 19947 and 1165, that added together give a palindrome (21112).

The spelling of 199471165 in words is "one hundred ninety-nine million, four hundred seventy-one thousand, one hundred sixty-five".