561056321 has 24 divisors (see below), whose sum is σ = 713373696. Its totient is φ = 437996160.

The previous prime is 561056297. The next prime is 561056333. The reversal of 561056321 is 123650165.

It is not a de Polignac number, because 561056321 - 2⁶ = 561056257 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (561056351) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14960 + ... + 36686.

It is an arithmetic number, because the mean of its divisors is an integer number (29723904).

Almost surely, 2^561056321 is an apocalyptic number.

It is an amenable number.

561056321 is a deficient number, since it is larger than the sum of its proper divisors (152317375).

561056321 is a wasteful number, since it uses less digits than its factorization.

561056321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21789 (or 21782 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 561056321 is about 23686.6274720569. The cubic root of 561056321 is about 824.7749963688.

It can be divided in two parts, 56105 and 6321, that added together give a palindrome (62426).

The spelling of 561056321 in words is "five hundred sixty-one million, fifty-six thousand, three hundred twenty-one".