199995901 has 6 divisors (see below), whose sum is σ = 232648350.
Its totient is φ = 171425016.
The previous prime is 199995889. The next prime is 199995923. The reversal of 199995901 is 109599991.
It can be written as a sum of positive squares in only one way, i.e., 139948900 + 60047001 = 11830^2 + 7749^2
It is not a de Polignac number, because 199995901 - 25 = 199995869 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 (199995931) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2040726 + ... + 2040823.
It is an arithmetic number, because the mean of its divisors is an integer number (38774725).
Almost surely, 2199995901 is an apocalyptic number.
It is an amenable number.
199995901 is a deficient number, since it is larger than the sum of its proper divisors (32652449).
199995901 is an equidigital number, since it uses as much as digits as its factorization.
199995901 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4081563 (or 4081556 counting only the distinct ones).
The product of its (nonzero) digits is 295245, while the sum is 52.
The square root of 199995901 is about 14141.9907014536.
The cubic root of 199995901 is about 584.7995524324.
The spelling of 199995901 in words is "one hundred ninety-nine million, nine hundred ninety-five thousand, nine hundred one".