199145 has 4 divisors (see below), whose sum is σ = 238980. Its totient is φ = 159312.

The previous prime is 199109. The next prime is 199151. The reversal of 199145 is 541991.

199145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 137641 + 61504 = 371^2 + 248^2 .

It is a cyclic number.

It is not a de Polignac number, because 199145 - 2⁶ = 199081 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 199145.

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, 19910 + ... + 19919.

It is an arithmetic number, because the mean of its divisors is an integer number (59745).

2¹⁹⁹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

199145 is a deficient number, since it is larger than the sum of its proper divisors (39835).

199145 is an equidigital number, since it uses as much as digits as its factorization.

199145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39834.

The product of its digits is 1620, while the sum is 29.

The square root of 199145 is about 446.2566526115. The cubic root of 199145 is about 58.3969012242.

It can be divided in two parts, 19 and 9145, that multiplied together give a triangular number (173755 = T₅₈₉).

The spelling of 199145 in words is "one hundred ninety-nine thousand, one hundred forty-five".