199842101 has 4 divisors (see below), whose sum is σ = 208530912. Its totient is φ = 191153292.

The previous prime is 199842079. The next prime is 199842163. The reversal of 199842101 is 101248991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101248991 = 17 ⋅5955823.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199842101 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 (199842301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4344371 + ... + 4344416.

It is an arithmetic number, because the mean of its divisors is an integer number (52132728).

Almost surely, 2^199842101 is an apocalyptic number.

It is an amenable number.

199842101 is a deficient number, since it is larger than the sum of its proper divisors (8688811).

199842101 is an equidigital number, since it uses as much as digits as its factorization.

199842101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8688810.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 199842101 is about 14136.5519487603. The cubic root of 199842101 is about 584.6496072981.

The spelling of 199842101 in words is "one hundred ninety-nine million, eight hundred forty-two thousand, one hundred one".