561897 has 20 divisors (see below), whose sum is σ = 960256. Its totient is φ = 320760.

The previous prime is 561839. The next prime is 561907. The reversal of 561897 is 798165.

561897 is a `hidden beast` number, since 561 + 8 + 97 = 666.

It is not a de Polignac number, because 561897 - 2¹⁰ = 560873 is a prime.

It is a Duffinian number.

561897 is a lucky number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (561097) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 72 + ... + 1062.

2⁵⁶¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

561897 is a deficient number, since it is larger than the sum of its proper divisors (398359).

561897 is an equidigital number, since it uses as much as digits as its factorization.

561897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010 (or 1001 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 561897 is about 749.5978922062. The cubic root of 561897 is about 82.5186734590.

It can be divided in two parts, 56 and 1897, that added together give a triangular number (1953 = T₆₂).

The spelling of 561897 in words is "five hundred sixty-one thousand, eight hundred ninety-seven".