199601901 has 24 divisors (see below), whose sum is σ = 308648704. Its totient is φ = 128770560.

The previous prime is 199601893. The next prime is 199601921. The reversal of 199601901 is 109106991.

It is not a de Polignac number, because 199601901 - 2³ = 199601893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199601921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5716 + ... + 20781.

Almost surely, 2^199601901 is an apocalyptic number.

It is an amenable number.

199601901 is a deficient number, since it is larger than the sum of its proper divisors (109046803).

199601901 is an equidigital number, since it uses as much as digits as its factorization.

199601901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26543 (or 26531 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The square root of 199601901 is about 14128.0536876103. The cubic root of 199601901 is about 584.4152737302.

The spelling of 199601901 in words is "one hundred ninety-nine million, six hundred one thousand, nine hundred one".