500100561 has 14 divisors (see below), whose sum is σ = 749808930. Its totient is φ = 333399888.

The previous prime is 500100541. The next prime is 500100571. The reversal of 500100561 is 165001005.

500100561 is a `hidden beast` number, since 5 + 0 + 0 + 100 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 386358336 + 113742225 = 19656^2 + 10665^2 .

It is not a de Polignac number, because 500100561 - 2⁹ = 500100049 is a prime.

It is a super-2 number, since 2×500100561² = 500201142225029442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (500100541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 342276 + ... + 343733.

Almost surely, 2^500100561 is an apocalyptic number.

It is an amenable number.

500100561 is a deficient number, since it is larger than the sum of its proper divisors (249708369).

500100561 is an frugal number, since it uses more digits than its factorization.

500100561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686027 (or 686012 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 500100561 is about 22362.9282742668. The cubic root of 500100561 is about 793.7537326296.

Adding to 500100561 its reverse (165001005), we get a palindrome (665101566).

The spelling of 500100561 in words is "five hundred million, one hundred thousand, five hundred sixty-one".