561857 has 8 divisors (see below), whose sum is σ = 583200. Its totient is φ = 541024.

The previous prime is 561839. The next prime is 561907. The reversal of 561857 is 758165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561857 - 2¹² = 557761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (566857) by changing a digit.

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, 5198 + ... + 5304.

It is an arithmetic number, because the mean of its divisors is an integer number (72900).

2⁵⁶¹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

561857 is a deficient number, since it is larger than the sum of its proper divisors (21343).

561857 is a wasteful number, since it uses less digits than its factorization.

561857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255.

The product of its digits is 8400, while the sum is 32.

The square root of 561857 is about 749.5712107599. The cubic root of 561857 is about 82.5167153153.

The spelling of 561857 in words is "five hundred sixty-one thousand, eight hundred fifty-seven".