199541 has 4 divisors (see below), whose sum is σ = 204972. Its totient is φ = 194112.

The previous prime is 199523. The next prime is 199559. The reversal of 199541 is 145991.

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

It is an interprime number because it is at equal distance from previous prime (199523) and next prime (199559).

It can be written as a sum of positive squares in 2 ways, for example, as 184900 + 14641 = 430^2 + 121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199541 is a prime.

It is a super-2 number, since 2×199541² = 79633221362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199501) 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, 2660 + ... + 2733.

It is an arithmetic number, because the mean of its divisors is an integer number (51243).

2¹⁹⁹⁵⁴¹ is an apocalyptic number.

It is an amenable number.

199541 is a deficient number, since it is larger than the sum of its proper divisors (5431).

199541 is an equidigital number, since it uses as much as digits as its factorization.

199541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5430.

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

The square root of 199541 is about 446.7001231251. The cubic root of 199541 is about 58.4355830250.

The spelling of 199541 in words is "one hundred ninety-nine thousand, five hundred forty-one".