201223009 has 4 divisors (see below), whose sum is σ = 216701716. Its totient is φ = 185744304.

The previous prime is 201222979. The next prime is 201223019. The reversal of 201223009 is 900322102.

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 38787984 + 162435025 = 6228^2 + 12745^2 .

It is a cyclic number.

It is not a de Polignac number, because 201223009 - 2¹⁷ = 201091937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201223019) 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, 7739334 + ... + 7739359.

It is an arithmetic number, because the mean of its divisors is an integer number (54175429).

Almost surely, 2^201223009 is an apocalyptic number.

It is an amenable number.

201223009 is a deficient number, since it is larger than the sum of its proper divisors (15478707).

201223009 is a wasteful number, since it uses less digits than its factorization.

201223009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15478706.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 201223009 is about 14185.3096194620. The cubic root of 201223009 is about 585.9931594211.

The spelling of 201223009 in words is "two hundred one million, two hundred twenty-three thousand, nine".