561001 has 9 divisors (see below), whose sum is σ = 658749. Its totient is φ = 476364.

The previous prime is 560977. The next prime is 561019. The reversal of 561001 is 100165.

The square root of 561001 is 749.

It is a perfect power (a square), and thus also a powerful number.

561001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 561001 - 2⁵ = 560969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561061) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5190 + ... + 5296.

2⁵⁶¹⁰⁰¹ is an apocalyptic number.

561001 is the 749-th square number.

561001 is the 375-th centered octagonal number.

It is an amenable number.

561001 is a deficient number, since it is larger than the sum of its proper divisors (97748).

561001 is an equidigital number, since it uses as much as digits as its factorization.

561001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 13.

The cubic root of 561001 is about 82.4747887458.

Adding to 561001 its reverse (100165), we get a palindrome (661166).

The spelling of 561001 in words is "five hundred sixty-one thousand, one".