500505561 has 10 divisors (see below), whose sum is σ = 747668922. Its totient is φ = 333670320.

The previous prime is 500505559. The next prime is 500505587. The reversal of 500505561 is 165505005.

500505561 is a `hidden beast` number, since 50 + 0 + 50 + 5 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 351787536 + 148718025 = 18756^2 + 12195^2 .

It is not a de Polignac number, because 500505561 - 2¹ = 500505559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (500505361) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3089460 + ... + 3089621.

Almost surely, 2^500505561 is an apocalyptic number.

It is an amenable number.

500505561 is a deficient number, since it is larger than the sum of its proper divisors (247163361).

500505561 is an equidigital number, since it uses as much as digits as its factorization.

500505561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6179093 (or 6179084 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 500505561 is about 22371.9816064648. The cubic root of 500505561 is about 793.9679452276.

It can be divided in two parts, 50050 and 5561, that added together give a triangular number (55611 = T₃₃₃).

The spelling of 500505561 in words is "five hundred million, five hundred five thousand, five hundred sixty-one".