561005500 has 48 divisors (see below), whose sum is σ = 1336634208. Its totient is φ = 204000000.

The previous prime is 561005461. The next prime is 561005503. The reversal of 561005500 is 5500165.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561005503) 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, 45501 + ... + 56500.

It is an arithmetic number, because the mean of its divisors is an integer number (27846546).

Almost surely, 2^561005500 is an apocalyptic number.

561005500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561005500 is an abundant number, since it is smaller than the sum of its proper divisors (775628708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561005500 is a wasteful number, since it uses less digits than its factorization.

561005500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102031 (or 102019 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 561005500 is about 23685.5546694605. The cubic root of 561005500 is about 824.7500926564.

Adding to 561005500 its reverse (5500165), we get a palindrome (566505665).

The spelling of 561005500 in words is "five hundred sixty-one million, five thousand, five hundred".