521253523 has 12 divisors (see below), whose sum is σ = 607412520. Its totient is φ = 446010432.

The previous prime is 521253497. The next prime is 521253527. The reversal of 521253523 is 325352125.

It is a de Polignac number, because none of the positive numbers 2^k-521253523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521253491 and 521253500.

It is not an unprimeable number, because it can be changed into a prime (521253527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20088 + ... + 38026.

It is an arithmetic number, because the mean of its divisors is an integer number (50617710).

Almost surely, 2^521253523 is an apocalyptic number.

521253523 is a deficient number, since it is larger than the sum of its proper divisors (86158997).

521253523 is a wasteful number, since it uses less digits than its factorization.

521253523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18546 (or 18539 counting only the distinct ones).

The product of its digits is 9000, while the sum is 28.

The square root of 521253523 is about 22830.9772677387. The cubic root of 521253523 is about 804.7907962984.

The spelling of 521253523 in words is "five hundred twenty-one million, two hundred fifty-three thousand, five hundred twenty-three".