201220009 has 4 divisors (see below), whose sum is σ = 208158660. Its totient is φ = 194281360.

The previous prime is 201219917. The next prime is 201220043. The reversal of 201220009 is 900022102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 154256400 + 46963609 = 12420^2 + 6853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201220009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201219974 and 201220001.

It is not an unprimeable number, because it can be changed into a prime (201220069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3469282 + ... + 3469339.

It is an arithmetic number, because the mean of its divisors is an integer number (52039665).

Almost surely, 2^201220009 is an apocalyptic number.

201220009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

201220009 is a deficient number, since it is larger than the sum of its proper divisors (6938651).

201220009 is an equidigital number, since it uses as much as digits as its factorization.

201220009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6938650.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 201220009 is about 14185.2038758701. The cubic root of 201220009 is about 585.9902472488.

The spelling of 201220009 in words is "two hundred one million, two hundred twenty thousand, nine".