195639801 has 24 divisors (see below), whose sum is σ = 309178944. Its totient is φ = 109680480.

The previous prime is 195639797. The next prime is 195639841. The reversal of 195639801 is 108936591.

It is not a de Polignac number, because 195639801 - 2² = 195639797 is a prime.

It is not an unprimeable number, because it can be changed into a prime (195639841) 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 23 ways as a sum of consecutive naturals, for example, 4765 + ... + 20346.

It is an arithmetic number, because the mean of its divisors is an integer number (12882456).

Almost surely, 2^195639801 is an apocalyptic number.

It is an amenable number.

195639801 is a deficient number, since it is larger than the sum of its proper divisors (113539143).

195639801 is a wasteful number, since it uses less digits than its factorization.

195639801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25181 (or 25174 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 195639801 is about 13987.1298342441. The cubic root of 195639801 is about 580.5225186213.

The spelling of 195639801 in words is "one hundred ninety-five million, six hundred thirty-nine thousand, eight hundred one".