504001561 has 16 divisors (see below), whose sum is σ = 591212160. Its totient is φ = 420635520.

The previous prime is 504001549. The next prime is 504001579. The reversal of 504001561 is 165100405.

It is a cyclic number.

It is not a de Polignac number, because 504001561 - 2¹¹ = 503999513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (504001591) 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 15 ways as a sum of consecutive naturals, for example, 176235 + ... + 179071.

It is an arithmetic number, because the mean of its divisors is an integer number (36950760).

Almost surely, 2^504001561 is an apocalyptic number.

It is an amenable number.

504001561 is a deficient number, since it is larger than the sum of its proper divisors (87210599).

504001561 is a wasteful number, since it uses less digits than its factorization.

504001561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3504.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 504001561 is about 22449.9790868499. The cubic root of 504001561 is about 795.8122631801.

Adding to 504001561 its reverse (165100405), we get a palindrome (669101966).

The spelling of 504001561 in words is "five hundred four million, one thousand, five hundred sixty-one".