521320331 has 8 divisors (see below), whose sum is σ = 595933920. Its totient is φ = 446741568.

The previous prime is 521320321. The next prime is 521320339. The reversal of 521320331 is 133023125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-521320331 is a prime.

It is a super-2 number, since 2×521320331² = 543549775027899122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521320339) 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, 48125 + ... + 57953.

It is an arithmetic number, because the mean of its divisors is an integer number (74491740).

Almost surely, 2^521320331 is an apocalyptic number.

521320331 is a deficient number, since it is larger than the sum of its proper divisors (74613589).

521320331 is an equidigital number, since it uses as much as digits as its factorization.

521320331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17413.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 521320331 is about 22832.4403207366. The cubic root of 521320331 is about 804.8251776274.

Adding to 521320331 its reverse (133023125), we get a palindrome (654343456).

The spelling of 521320331 in words is "five hundred twenty-one million, three hundred twenty thousand, three hundred thirty-one".