521541818 has 16 divisors (see below), whose sum is σ = 895349760. Its totient is φ = 223198416.

The previous prime is 521541817. The next prime is 521541847. The reversal of 521541818 is 818145125.

It is not an unprimeable number, because it can be changed into a prime (521541817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16346 + ... + 36197.

It is an arithmetic number, because the mean of its divisors is an integer number (55959360).

Almost surely, 2^521541818 is an apocalyptic number.

521541818 is a deficient number, since it is larger than the sum of its proper divisors (373807942).

521541818 is a wasteful number, since it uses less digits than its factorization.

521541818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53261.

The product of its digits is 12800, while the sum is 35.

The square root of 521541818 is about 22837.2900756635. The cubic root of 521541818 is about 804.9391402365.

The spelling of 521541818 in words is "five hundred twenty-one million, five hundred forty-one thousand, eight hundred eighteen".