521765484 has 12 divisors (see below), whose sum is σ = 1217452824. Its totient is φ = 173921824.

The previous prime is 521765449. The next prime is 521765501. The reversal of 521765484 is 484567125.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21740217 + ... + 21740240.

It is an arithmetic number, because the mean of its divisors is an integer number (101454402).

Almost surely, 2^521765484 is an apocalyptic number.

It is an amenable number.

521765484 is an abundant number, since it is smaller than the sum of its proper divisors (695687340).

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

521765484 is a wasteful number, since it uses less digits than its factorization.

521765484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43480464 (or 43480462 counting only the distinct ones).

The product of its digits is 268800, while the sum is 42.

The square root of 521765484 is about 22842.1864977939. The cubic root of 521765484 is about 805.0541912775.

The spelling of 521765484 in words is "five hundred twenty-one million, seven hundred sixty-five thousand, four hundred eighty-four".