133205506 has 16 divisors (see below), whose sum is σ = 241785216. Its totient is φ = 53729856.

The previous prime is 133205503. The next prime is 133205531. The reversal of 133205506 is 605502331.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (133205503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279606 + ... + 280081.

It is an arithmetic number, because the mean of its divisors is an integer number (15111576).

Almost surely, 2^133205506 is an apocalyptic number.

133205506 is a deficient number, since it is larger than the sum of its proper divisors (108579710).

133205506 is a wasteful number, since it uses less digits than its factorization.

133205506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559713.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 133205506 is about 11541.4689706293. The cubic root of 133205506 is about 510.7096439101.

Adding to 133205506 its reverse (605502331), we get a palindrome (738707837).

The spelling of 133205506 in words is "one hundred thirty-three million, two hundred five thousand, five hundred six".