561654 has 20 divisors (see below), whose sum is σ = 1258884. Its totient is φ = 187164.

The previous prime is 561607. The next prime is 561667. The reversal of 561654 is 456165.

It is a happy number.

561654 is a `hidden beast` number, since 5 + 6 + 1 + 654 = 666.

561654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 561654.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1572 + ... + 1895.

2⁵⁶¹⁶⁵⁴ is an apocalyptic number.

561654 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

561654 is an abundant number, since it is smaller than the sum of its proper divisors (697230).

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

561654 is a wasteful number, since it uses less digits than its factorization.

561654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481 (or 3472 counting only the distinct ones).

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

The square root of 561654 is about 749.4357877764. The cubic root of 561654 is about 82.5067763029.

561654 divided by its sum of digits (27) gives a palindrome (20802).

It can be divided in two parts, 56165 and 4, that added together give a square (56169 = 237²).

The spelling of 561654 in words is "five hundred sixty-one thousand, six hundred fifty-four".