523213506 has 40 divisors (see below), whose sum is σ = 1177299024. Its totient is φ = 174391380.

The previous prime is 523213477. The next prime is 523213571. The reversal of 523213506 is 605312325.

523213506 is a `hidden beast` number, since 523 + 2 + 135 + 0 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 523213506.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 32721 + ... + 46011.

Almost surely, 2^523213506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 523213506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (588649512).

523213506 is an abundant number, since it is smaller than the sum of its proper divisors (654085518).

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

523213506 is an frugal number, since it uses more digits than its factorization.

523213506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13320 (or 13296 counting only the distinct ones).

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

The square root of 523213506 is about 22873.8607585165. The cubic root of 523213506 is about 805.7982416718.

The spelling of 523213506 in words is "five hundred twenty-three million, two hundred thirteen thousand, five hundred six".