561541831 has 4 divisors (see below), whose sum is σ = 563238664. Its totient is φ = 559845000.

The previous prime is 561541801. The next prime is 561541847. The reversal of 561541831 is 138145165.

561541831 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 a cyclic number.

It is not a de Polignac number, because 561541831 - 2⁹ = 561541319 is a prime.

It is a super-2 number, since 2×561541831² = 630658455925665122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561541801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 847920 + ... + 848581.

It is an arithmetic number, because the mean of its divisors is an integer number (140809666).

Almost surely, 2^561541831 is an apocalyptic number.

561541831 is a deficient number, since it is larger than the sum of its proper divisors (1696833).

561541831 is a wasteful number, since it uses less digits than its factorization.

561541831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696832.

The product of its digits is 14400, while the sum is 34.

The square root of 561541831 is about 23696.8738655545. The cubic root of 561541831 is about 825.0128340826.

Adding to 561541831 its reverse (138145165), we get a palindrome (699686996).

The spelling of 561541831 in words is "five hundred sixty-one million, five hundred forty-one thousand, eight hundred thirty-one".