199011901 has 4 divisors (see below), whose sum is σ = 217103904. Its totient is φ = 180919900.

The previous prime is 199011887. The next prime is 199011929. The reversal of 199011901 is 109110991.

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.

It is a cyclic number.

It is not a de Polignac number, because 199011901 - 2⁷ = 199011773 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 (199011931) 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, 9045985 + ... + 9046006.

It is an arithmetic number, because the mean of its divisors is an integer number (54275976).

Almost surely, 2^199011901 is an apocalyptic number.

199011901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

199011901 is a deficient number, since it is larger than the sum of its proper divisors (18092003).

199011901 is a wasteful number, since it uses less digits than its factorization.

199011901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18092002.

The product of its (nonzero) digits is 729, while the sum is 31.

The square root of 199011901 is about 14107.1577931205. The cubic root of 199011901 is about 583.8388842549.

The spelling of 199011901 in words is "one hundred ninety-nine million, eleven thousand, nine hundred one".