201609906 has 16 divisors (see below), whose sum is σ = 403359264. Its totient is φ = 67180064.

The previous prime is 201609871. The next prime is 201609907. The reversal of 201609906 is 609906102.

It is a happy number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (201609907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29401 + ... + 35603.

It is an arithmetic number, because the mean of its divisors is an integer number (25209954).

Almost surely, 2^201609906 is an apocalyptic number.

201609906 is an abundant number, since it is smaller than the sum of its proper divisors (201749358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201609906 is a wasteful number, since it uses less digits than its factorization.

201609906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11625.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 201609906 is about 14198.9403125726. The cubic root of 201609906 is about 586.3684873475.

The spelling of 201609906 in words is "two hundred one million, six hundred nine thousand, nine hundred six".