199539541 has 8 divisors (see below), whose sum is σ = 204795864. Its totient is φ = 194338560.

The previous prime is 199539533. The next prime is 199539563. The reversal of 199539541 is 145935991.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 112042225 + 87497316 = 10585^2 + 9354^2 .

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 199539541 - 2³ = 199539533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199539491 and 199539500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199539511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6480 + ... + 21001.

It is an arithmetic number, because the mean of its divisors is an integer number (25599483).

Almost surely, 2^199539541 is an apocalyptic number.

It is an amenable number.

199539541 is a deficient number, since it is larger than the sum of its proper divisors (5256323).

199539541 is a wasteful number, since it uses less digits than its factorization.

199539541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27671.

The product of its digits is 218700, while the sum is 46.

The square root of 199539541 is about 14125.8465587022. The cubic root of 199539541 is about 584.3544060193.

The spelling of 199539541 in words is "one hundred ninety-nine million, five hundred thirty-nine thousand, five hundred forty-one".