561843123 has 16 divisors (see below), whose sum is σ = 777616896. Its totient is φ = 360577440.

The previous prime is 561843097. The next prime is 561843133. The reversal of 561843123 is 321348165.

It is not a de Polignac number, because 561843123 - 2¹² = 561839027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561843133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24061 + ... + 41262.

It is an arithmetic number, because the mean of its divisors is an integer number (48601056).

Almost surely, 2^561843123 is an apocalyptic number.

561843123 is a deficient number, since it is larger than the sum of its proper divisors (215773773).

561843123 is a wasteful number, since it uses less digits than its factorization.

561843123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65434.

The product of its digits is 17280, while the sum is 33.

The square root of 561843123 is about 23703.2302229042. The cubic root of 561843123 is about 825.1603596453.

The spelling of 561843123 in words is "five hundred sixty-one million, eight hundred forty-three thousand, one hundred twenty-three".