501521216 has 56 divisors (see below), whose sum is σ = 1204301376. Its totient is φ = 202291200.

The previous prime is 501521203. The next prime is 501521239. The reversal of 501521216 is 612125105.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a junction number, because it is equal to n+sod(n) for n = 501521191 and 501521200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25310 + ... + 40541.

Almost surely, 2^501521216 is an apocalyptic number.

501521216 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

501521216 is an abundant number, since it is smaller than the sum of its proper divisors (702780160).

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

501521216 is a wasteful number, since it uses less digits than its factorization.

501521216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65887 (or 65877 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 501521216 is about 22394.6693657218. The cubic root of 501521216 is about 794.5046376758.

The spelling of 501521216 in words is "five hundred one million, five hundred twenty-one thousand, two hundred sixteen".