199161925 has 12 divisors (see below), whose sum is σ = 248393700. Its totient is φ = 158405120.

The previous prime is 199161901. The next prime is 199161929. The reversal of 199161925 is 529161991.

It can be written as a sum of positive squares in 6 ways, for example, as 11115556 + 188046369 = 3334^2 + 13713^2 .

It is a de Polignac number, because none of the positive numbers 2^k-199161925 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199161929) 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 11 ways as a sum of consecutive naturals, for example, 18700 + ... + 27349.

It is an arithmetic number, because the mean of its divisors is an integer number (20699475).

Almost surely, 2^199161925 is an apocalyptic number.

It is an amenable number.

199161925 is a deficient number, since it is larger than the sum of its proper divisors (49231775).

199161925 is a wasteful number, since it uses less digits than its factorization.

199161925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46232 (or 46227 counting only the distinct ones).

The product of its digits is 43740, while the sum is 43.

The square root of 199161925 is about 14112.4740920931. The cubic root of 199161925 is about 583.9855552895.

The spelling of 199161925 in words is "one hundred ninety-nine million, one hundred sixty-one thousand, nine hundred twenty-five".