133223609 has 4 divisors (see below), whose sum is σ = 135737316. Its totient is φ = 130709904.

The previous prime is 133223579. The next prime is 133223617. The reversal of 133223609 is 906322331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 906322331 = 5419 ⋅167249.

It can be written as a sum of positive squares in 2 ways, for example, as 65934400 + 67289209 = 8120^2 + 8203^2 .

It is a cyclic number.

It is not a de Polignac number, because 133223609 - 2⁸ = 133223353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133223639) 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, 1256774 + ... + 1256879.

It is an arithmetic number, because the mean of its divisors is an integer number (33934329).

Almost surely, 2^133223609 is an apocalyptic number.

It is an amenable number.

133223609 is a deficient number, since it is larger than the sum of its proper divisors (2513707).

133223609 is an equidigital number, since it uses as much as digits as its factorization.

133223609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513706.

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 133223609 is about 11542.2532029063. The cubic root of 133223609 is about 510.7327784841.

The spelling of 133223609 in words is "one hundred thirty-three million, two hundred twenty-three thousand, six hundred nine".