199216901 has 4 divisors (see below), whose sum is σ = 214541292. Its totient is φ = 183892512.

The previous prime is 199216889. The next prime is 199216903. The reversal of 199216901 is 109612991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108472225 + 90744676 = 10415^2 + 9526^2 .

It is a cyclic number.

It is not a de Polignac number, because 199216901 - 2⁶ = 199216837 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 (199216903) 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, 7662176 + ... + 7662201.

It is an arithmetic number, because the mean of its divisors is an integer number (53635323).

Almost surely, 2^199216901 is an apocalyptic number.

It is an amenable number.

199216901 is a deficient number, since it is larger than the sum of its proper divisors (15324391).

199216901 is a wasteful number, since it uses less digits than its factorization.

199216901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15324390.

The product of its (nonzero) digits is 8748, while the sum is 38.

The square root of 199216901 is about 14114.4217380664. The cubic root of 199216901 is about 584.0392841607.

The spelling of 199216901 in words is "one hundred ninety-nine million, two hundred sixteen thousand, nine hundred one".