133540506 has 48 divisors (see below), whose sum is σ = 319999680. Its totient is φ = 39908160.

The previous prime is 133540501. The next prime is 133540513. The reversal of 133540506 is 605045331.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 133540506.

It is not an unprimeable number, because it can be changed into a prime (133540501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9835 + ... + 19073.

It is an arithmetic number, because the mean of its divisors is an integer number (6666660).

Almost surely, 2^133540506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133540506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159999840).

133540506 is an abundant number, since it is smaller than the sum of its proper divisors (186459174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133540506 is a wasteful number, since it uses less digits than its factorization.

133540506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9331 (or 9328 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 133540506 is about 11555.9727414009. The cubic root of 133540506 is about 511.1374152849.

Adding to 133540506 its reverse (605045331), we get a palindrome (738585837).

The spelling of 133540506 in words is "one hundred thirty-three million, five hundred forty thousand, five hundred six".