201009999 has 8 divisors (see below), whose sum is σ = 268561152. Its totient is φ = 133732760.

The previous prime is 201009997. The next prime is 201010001. The reversal of 201009999 is 999900102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (201009997) and next prime (201010001).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201009999 - 2¹ = 201009997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201009997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66759 + ... + 69704.

It is an arithmetic number, because the mean of its divisors is an integer number (33570144).

Almost surely, 2^201009999 is an apocalyptic number.

201009999 is a deficient number, since it is larger than the sum of its proper divisors (67551153).

201009999 is a wasteful number, since it uses less digits than its factorization.

201009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136957.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 201009999 is about 14177.7995119130. The cubic root of 201009999 is about 585.7863135040.

The spelling of 201009999 in words is "two hundred one million, nine thousand, nine hundred ninety-nine".