201007809 has 12 divisors (see below), whose sum is σ = 290529252. Its totient is φ = 133920000.

The previous prime is 201007801. The next prime is 201007817. The reversal of 201007809 is 908700102.

It is an interprime number because it is at equal distance from previous prime (201007801) and next prime (201007817).

It can be written as a sum of positive squares in 2 ways, for example, as 48608784 + 152399025 = 6972^2 + 12345^2 .

It is not a de Polignac number, because 201007809 - 2³ = 201007801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201007801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10009 + ... + 22409.

It is an arithmetic number, because the mean of its divisors is an integer number (24210771).

Almost surely, 2^201007809 is an apocalyptic number.

It is an amenable number.

201007809 is a deficient number, since it is larger than the sum of its proper divisors (89521443).

201007809 is a wasteful number, since it uses less digits than its factorization.

201007809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14208 (or 14205 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 201007809 is about 14177.7222782787. The cubic root of 201007809 is about 585.7841861195.

The spelling of 201007809 in words is "two hundred one million, seven thousand, eight hundred nine".