501220111 has 8 divisors (see below), whose sum is σ = 574448544. Its totient is φ = 428398080.

The previous prime is 501220087. The next prime is 501220147. The reversal of 501220111 is 111022105.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 501220111 - 2¹⁵ = 501187343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 501220091 and 501220100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501220211) 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 7 ways as a sum of consecutive naturals, for example, 98950 + ... + 103891.

It is an arithmetic number, because the mean of its divisors is an integer number (71806068).

Almost surely, 2^501220111 is an apocalyptic number.

501220111 is a deficient number, since it is larger than the sum of its proper divisors (73228433).

501220111 is a wasteful number, since it uses less digits than its factorization.

501220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203201.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 501220111 is about 22387.9456627892. The cubic root of 501220111 is about 794.3456033859.

Adding to 501220111 its reverse (111022105), we get a palindrome (612242216).

The spelling of 501220111 in words is "five hundred one million, two hundred twenty thousand, one hundred eleven".