199942101 has 16 divisors (see below), whose sum is σ = 299870720. Its totient is φ = 133293276.

The previous prime is 199942097. The next prime is 199942139. The reversal of 199942101 is 101249991.

It is not a de Polignac number, because 199942101 - 2² = 199942097 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 (199942181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43525 + ... + 47898.

It is an arithmetic number, because the mean of its divisors is an integer number (18741920).

Almost surely, 2^199942101 is an apocalyptic number.

It is an amenable number.

199942101 is a deficient number, since it is larger than the sum of its proper divisors (99928619).

199942101 is an frugal number, since it uses more digits than its factorization.

199942101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91444 (or 91426 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 199942101 is about 14140.0884367814. The cubic root of 199942101 is about 584.7471096284.

It can be divided in two parts, 1999 and 42101, that added together give a square (44100 = 210²).

The spelling of 199942101 in words is "one hundred ninety-nine million, nine hundred forty-two thousand, one hundred one".