199999501 has 8 divisors (see below), whose sum is σ = 216660920. Its totient is φ = 184612896.

The previous prime is 199999483. The next prime is 199999589. The reversal of 199999501 is 105999991.

199999501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 35390601 + 164608900 = 5949^2 + 12830^2 .

It is not a de Polignac number, because 199999501 - 2⁹ = 199998989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43320 + ... + 47713.

It is an arithmetic number, because the mean of its divisors is an integer number (27082615).

Almost surely, 2^199999501 is an apocalyptic number.

It is an amenable number.

199999501 is a deficient number, since it is larger than the sum of its proper divisors (16661419).

199999501 is an frugal number, since it uses more digits than its factorization.

199999501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91072 (or 91046 counting only the distinct ones).

The product of its (nonzero) digits is 295245, while the sum is 52.

The square root of 199999501 is about 14142.1179814058. The cubic root of 199999501 is about 584.8030612806.

The spelling of 199999501 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, five hundred one".