501000561 has 24 divisors (see below), whose sum is σ = 731503656. Its totient is φ = 330405120.

The previous prime is 501000551. The next prime is 501000571. The reversal of 501000561 is 165000105.

501000561 is a `hidden beast` number, since 5 + 0 + 100 + 0 + 561 = 666.

It is an interprime number because it is at equal distance from previous prime (501000551) and next prime (501000571).

It can be written as a sum of positive squares in 4 ways, for example, as 95179536 + 405821025 = 9756^2 + 20145^2 .

It is not a de Polignac number, because 501000561 - 2²² = 496806257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (501000551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 362091 + ... + 363471.

It is an arithmetic number, because the mean of its divisors is an integer number (30479319).

Almost surely, 2^501000561 is an apocalyptic number.

It is an amenable number.

501000561 is a deficient number, since it is larger than the sum of its proper divisors (230503095).

501000561 is a wasteful number, since it uses less digits than its factorization.

501000561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793 (or 1790 counting only the distinct ones).

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

The square root of 501000561 is about 22383.0418174117. The cubic root of 501000561 is about 794.2296037525.

Adding to 501000561 its reverse (165000105), we get a palindrome (666000666).

The spelling of 501000561 in words is "five hundred one million, five hundred sixty-one", and thus it is an aban number.