201996009 has 12 divisors (see below), whose sum is σ = 292546800. Its totient is φ = 134306424.

The previous prime is 201995993. The next prime is 201996013. The reversal of 201996009 is 900699102.

It is not a de Polignac number, because 201996009 - 2⁴ = 201995993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201996059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26199 + ... + 33020.

It is an arithmetic number, because the mean of its divisors is an integer number (24378900).

Almost surely, 2^201996009 is an apocalyptic number.

It is an amenable number.

201996009 is a deficient number, since it is larger than the sum of its proper divisors (90550791).

201996009 is a wasteful number, since it uses less digits than its factorization.

201996009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59604 (or 59601 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 201996009 is about 14212.5299999683. The cubic root of 201996009 is about 586.7425666191.

The spelling of 201996009 in words is "two hundred one million, nine hundred ninety-six thousand, nine".