199601955 has 32 divisors (see below), whose sum is σ = 405542400. Its totient is φ = 91246176.

The previous prime is 199601923. The next prime is 199601959. The reversal of 199601955 is 559106991.

It is a happy number.

It is not a de Polignac number, because 199601955 - 2⁵ = 199601923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 199601955.

It is not an unprimeable number, because it can be changed into a prime (199601959) 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 31 ways as a sum of consecutive naturals, for example, 104665 + ... + 106554.

It is an arithmetic number, because the mean of its divisors is an integer number (12673200).

Almost surely, 2^199601955 is an apocalyptic number.

199601955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

199601955 is an abundant number, since it is smaller than the sum of its proper divisors (205940445).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199601955 is a wasteful number, since it uses less digits than its factorization.

199601955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211240 (or 211234 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 45.

The square root of 199601955 is about 14128.0555987015. The cubic root of 199601955 is about 584.4153264325.

The spelling of 199601955 in words is "one hundred ninety-nine million, six hundred one thousand, nine hundred fifty-five".