521443316 has 24 divisors (see below), whose sum is σ = 944939520. Its totient is φ = 251478752.

The previous prime is 521443313. The next prime is 521443361. The reversal of 521443316 is 613344125.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521443313) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 170981 + ... + 174003.

It is an arithmetic number, because the mean of its divisors is an integer number (39372480).

Almost surely, 2^521443316 is an apocalyptic number.

It is an amenable number.

521443316 is a deficient number, since it is larger than the sum of its proper divisors (423496204).

521443316 is a wasteful number, since it uses less digits than its factorization.

521443316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4543 (or 4541 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 521443316 is about 22835.1333694375. The cubic root of 521443316 is about 804.8884615855. Note that the first 3 decimals are identical.

The spelling of 521443316 in words is "five hundred twenty-one million, four hundred forty-three thousand, three hundred sixteen".