561531066 has 16 divisors (see below), whose sum is σ = 1149180384. Its totient is φ = 182823984.

The previous prime is 561531053. The next prime is 561531071. The reversal of 561531066 is 660135165.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1087981 + ... + 1088496.

It is an arithmetic number, because the mean of its divisors is an integer number (71823774).

Almost surely, 2^561531066 is an apocalyptic number.

561531066 is an abundant number, since it is smaller than the sum of its proper divisors (587649318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561531066 is a wasteful number, since it uses less digits than its factorization.

561531066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176525.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 561531066 is about 23696.6467248005. The cubic root of 561531066 is about 825.0075620978.

The spelling of 561531066 in words is "five hundred sixty-one million, five hundred thirty-one thousand, sixty-six".