199109902 has 4 divisors (see below), whose sum is σ = 298664856. Its totient is φ = 99554950.

The previous prime is 199109891. The next prime is 199109903. The reversal of 199109902 is 209901991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 209901991 = 13 ⋅16146307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199109903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49777474 + ... + 49777477.

It is an arithmetic number, because the mean of its divisors is an integer number (74666214).

Almost surely, 2^199109902 is an apocalyptic number.

199109902 is a deficient number, since it is larger than the sum of its proper divisors (99554954).

199109902 is an equidigital number, since it uses as much as digits as its factorization.

199109902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99554953.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 199109902 is about 14110.6308150982. The cubic root of 199109902 is about 583.9347033237.

The spelling of 199109902 in words is "one hundred ninety-nine million, one hundred nine thousand, nine hundred two".