500131221 has 4 divisors (see below), whose sum is σ = 666841632. Its totient is φ = 333420812.

The previous prime is 500131213. The next prime is 500131223. The reversal of 500131221 is 122131005.

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 500131221 - 2³ = 500131213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 500131221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (500131223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83355201 + ... + 83355206.

It is an arithmetic number, because the mean of its divisors is an integer number (166710408).

Almost surely, 2^500131221 is an apocalyptic number.

It is an amenable number.

500131221 is a deficient number, since it is larger than the sum of its proper divisors (166710411).

500131221 is a wasteful number, since it uses less digits than its factorization.

500131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166710410.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 500131221 is about 22363.6137732702. The cubic root of 500131221 is about 793.7699533620.

Adding to 500131221 its reverse (122131005), we get a palindrome (622262226).

The spelling of 500131221 in words is "five hundred million, one hundred thirty-one thousand, two hundred twenty-one".