561550 has 24 divisors (see below), whose sum is σ = 1140552. Its totient is φ = 204000.

The previous prime is 561529. The next prime is 561551. The reversal of 561550 is 55165.

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 (561551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40 + ... + 1060.

It is an arithmetic number, because the mean of its divisors is an integer number (47523).

2⁵⁶¹⁵⁵⁰ is an apocalyptic number.

561550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

561550 is an abundant number, since it is smaller than the sum of its proper divisors (579002).

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

561550 is a wasteful number, since it uses less digits than its factorization.

561550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1039 counting only the distinct ones).

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

The square root of 561550 is about 749.3663990332. The cubic root of 561550 is about 82.5016834673.

It can be divided in two parts, 5615 and 50, that added together give a palindrome (5665).

The spelling of 561550 in words is "five hundred sixty-one thousand, five hundred fifty".