521223996 has 24 divisors (see below), whose sum is σ = 1218680064. Its totient is φ = 173385520.

The previous prime is 521223991. The next prime is 521224001. The reversal of 521223996 is 699322125.

521223996 = 2655² + 2656² + ... + 2726².

It is an interprime number because it is at equal distance from previous prime (521223991) and next prime (521224001).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521223991) 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, 38340 + ... + 50123.

It is an arithmetic number, because the mean of its divisors is an integer number (50778336).

Almost surely, 2^521223996 is an apocalyptic number.

It is an amenable number.

521223996 is an abundant number, since it is smaller than the sum of its proper divisors (697456068).

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

521223996 is a wasteful number, since it uses less digits than its factorization.

521223996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88961 (or 88959 counting only the distinct ones).

The product of its digits is 58320, while the sum is 39.

The square root of 521223996 is about 22830.3306152145. The cubic root of 521223996 is about 804.7755999141.

The spelling of 521223996 in words is "five hundred twenty-one million, two hundred twenty-three thousand, nine hundred ninety-six".