561546 has 16 divisors (see below), whose sum is σ = 1248000. Its totient is φ = 187164.

The previous prime is 561529. The next prime is 561551. The reversal of 561546 is 645165.

It is a happy number.

561546 is a `hidden beast` number, since 5 + 615 + 46 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is a Curzon number.

It is an unprimeable number.

561546 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5146 + ... + 5253.

It is an arithmetic number, because the mean of its divisors is an integer number (78000).

2⁵⁶¹⁵⁴⁶ is an apocalyptic number.

561546 is an abundant number, since it is smaller than the sum of its proper divisors (686454).

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

561546 is a wasteful number, since it uses less digits than its factorization.

561546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10410 (or 10404 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 561546 is about 749.3637301071. The cubic root of 561546 is about 82.5014875765.

The spelling of 561546 in words is "five hundred sixty-one thousand, five hundred forty-six".