501516421 has 16 divisors (see below), whose sum is σ = 587382400. Its totient is φ = 428016960.

The previous prime is 501516397. The next prime is 501516427. The reversal of 501516421 is 124615105.

It is a happy number.

It is not a de Polignac number, because 501516421 - 2⁹ = 501515909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501516427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79630 + ... + 85696.

It is an arithmetic number, because the mean of its divisors is an integer number (36711400).

Almost surely, 2^501516421 is an apocalyptic number.

It is an amenable number.

501516421 is a deficient number, since it is larger than the sum of its proper divisors (85865979).

501516421 is an equidigital number, since it uses as much as digits as its factorization.

501516421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6329 (or 6315 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 501516421 is about 22394.5623087391. The cubic root of 501516421 is about 794.5021056049.

The spelling of 501516421 in words is "five hundred one million, five hundred sixteen thousand, four hundred twenty-one".