501328040621 has 4 divisors (see below), whose sum is σ = 503325363744. Its totient is φ = 499330717500.

The previous prime is 501328040561. The next prime is 501328040627. The reversal of 501328040621 is 126040823105.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 501328040621 - 2⁶ = 501328040557 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 (501328040627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998661185 + ... + 998661686.

It is an arithmetic number, because the mean of its divisors is an integer number (125831340936).

Almost surely, 2^501328040621 is an apocalyptic number.

It is an amenable number.

501328040621 is a deficient number, since it is larger than the sum of its proper divisors (1997323123).

501328040621 is a wasteful number, since it uses less digits than its factorization.

501328040621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997323122.

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 501328040621 its reverse (126040823105), we get a palindrome (627368863726).

The spelling of 501328040621 in words is "five hundred one billion, three hundred twenty-eight million, forty thousand, six hundred twenty-one".