201219989 has 4 divisors (see below), whose sum is σ = 201426924. Its totient is φ = 201013056.

The previous prime is 201219917. The next prime is 201220043. The reversal of 201219989 is 989912102.

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 186459025 + 14760964 = 13655^2 + 3842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201219989 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 (201219289) 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, 102002 + ... + 103955.

It is an arithmetic number, because the mean of its divisors is an integer number (50356731).

Almost surely, 2^201219989 is an apocalyptic number.

It is an amenable number.

201219989 is a deficient number, since it is larger than the sum of its proper divisors (206935).

201219989 is an equidigital number, since it uses as much as digits as its factorization.

201219989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206934.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 201219989 is about 14185.2031709102. The cubic root of 201219989 is about 585.9902278343.

The spelling of 201219989 in words is "two hundred one million, two hundred nineteen thousand, nine hundred eighty-nine".