521795526 has 64 divisors (see below), whose sum is σ = 1247920128. Its totient is φ = 142214688.

The previous prime is 521795513. The next prime is 521795557. The reversal of 521795526 is 625597125.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 701911 + ... + 702653.

It is an arithmetic number, because the mean of its divisors is an integer number (19498752).

Almost surely, 2^521795526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521795526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (623960064).

521795526 is an abundant number, since it is smaller than the sum of its proper divisors (726124602).

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

521795526 is a wasteful number, since it uses less digits than its factorization.

521795526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505.

The product of its digits is 189000, while the sum is 42.

The square root of 521795526 is about 22842.8440873723. The cubic root of 521795526 is about 805.0696420081.

The spelling of 521795526 in words is "five hundred twenty-one million, seven hundred ninety-five thousand, five hundred twenty-six".