133243506 has 72 divisors (see below), whose sum is σ = 320432112. Its totient is φ = 39982800.

The previous prime is 133243493. The next prime is 133243547. The reversal of 133243506 is 605342331.

It is a happy number.

133243506 is a `hidden beast` number, since 133 + 24 + 3 + 506 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 133243506.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 285085 + ... + 285551.

It is an arithmetic number, because the mean of its divisors is an integer number (4450446).

Almost surely, 2^133243506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133243506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160216056).

133243506 is an abundant number, since it is smaller than the sum of its proper divisors (187188606).

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

133243506 is a wasteful number, since it uses less digits than its factorization.

133243506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 133243506 is about 11543.1150908236. The cubic root of 133243506 is about 510.7582032676.

Adding to 133243506 its reverse (605342331), we get a palindrome (738585837).

The spelling of 133243506 in words is "one hundred thirty-three million, two hundred forty-three thousand, five hundred six".