201489309 has 32 divisors (see below), whose sum is σ = 350378240. Its totient is φ = 112021056.

The previous prime is 201489259. The next prime is 201489331. The reversal of 201489309 is 903984102.

201489309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201489309 - 2¹⁶ = 201423773 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 (201489809) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7414 + ... + 21399.

It is an arithmetic number, because the mean of its divisors is an integer number (10949320).

Almost surely, 2^201489309 is an apocalyptic number.

It is an amenable number.

201489309 is a deficient number, since it is larger than the sum of its proper divisors (148888931).

201489309 is a wasteful number, since it uses less digits than its factorization.

201489309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28866 (or 28860 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 201489309 is about 14194.6929871695. The cubic root of 201489309 is about 586.2515480128.

The spelling of 201489309 in words is "two hundred one million, four hundred eighty-nine thousand, three hundred nine".