199725541 has 4 divisors (see below), whose sum is σ = 199759084. Its totient is φ = 199692000.

The previous prime is 199725481. The next prime is 199725551. The reversal of 199725541 is 145527991.

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 70812225 + 128913316 = 8415^2 + 11354^2 .

It is a 3-Lehmer number, since φ(199725541) divides (199725541-1)³.

It is a cyclic number.

It is not a de Polignac number, because 199725541 - 2⁷ = 199725413 is a prime.

It is a deceptive number, since it divides R_199725540.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199725551) 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 3 ways as a sum of consecutive naturals, for example, 5160 + ... + 20641.

It is an arithmetic number, because the mean of its divisors is an integer number (49939771).

Almost surely, 2^199725541 is an apocalyptic number.

It is an amenable number.

199725541 is a deficient number, since it is larger than the sum of its proper divisors (33543).

199725541 is an equidigital number, since it uses as much as digits as its factorization.

199725541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33542.

The product of its digits is 113400, while the sum is 43.

The square root of 199725541 is about 14132.4287013945. The cubic root of 199725541 is about 584.5359175213.

The spelling of 199725541 in words is "one hundred ninety-nine million, seven hundred twenty-five thousand, five hundred forty-one".