561854 has 4 divisors (see below), whose sum is σ = 842784. Its totient is φ = 280926.

The previous prime is 561839. The next prime is 561907. The reversal of 561854 is 458165.

It is a happy number.

561854 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140462 + ... + 140465.

It is an arithmetic number, because the mean of its divisors is an integer number (210696).

2⁵⁶¹⁸⁵⁴ is an apocalyptic number.

561854 is a deficient number, since it is larger than the sum of its proper divisors (280930).

561854 is a wasteful number, since it uses less digits than its factorization.

561854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280929.

The product of its digits is 4800, while the sum is 29.

The square root of 561854 is about 749.5692096131. The cubic root of 561854 is about 82.5165684507.

The spelling of 561854 in words is "five hundred sixty-one thousand, eight hundred fifty-four".