199995155 has 8 divisors (see below), whose sum is σ = 241884672. Its totient is φ = 158735808.

The previous prime is 199995151. The next prime is 199995163. The reversal of 199995155 is 551599991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199995155 - 2² = 199995151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199995097 and 199995106.

It is not an unprimeable number, because it can be changed into a prime (199995151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156842 + ... + 158111.

It is an arithmetic number, because the mean of its divisors is an integer number (30235584).

Almost surely, 2^199995155 is an apocalyptic number.

199995155 is a deficient number, since it is larger than the sum of its proper divisors (41889517).

199995155 is a wasteful number, since it uses less digits than its factorization.

199995155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315085.

The product of its digits is 820125, while the sum is 53.

The square root of 199995155 is about 14141.9643260758. The cubic root of 199995155 is about 584.7988253158.

The spelling of 199995155 in words is "one hundred ninety-nine million, nine hundred ninety-five thousand, one hundred fifty-five".