561065321 has 4 divisors (see below), whose sum is σ = 561831492. Its totient is φ = 560299152.

The previous prime is 561065317. The next prime is 561065387. The reversal of 561065321 is 123560165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 522625321 + 38440000 = 22861^2 + 6200^2 .

It is a cyclic number.

It is not a de Polignac number, because 561065321 - 2² = 561065317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (561065221) 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, 381986 + ... + 383451.

It is an arithmetic number, because the mean of its divisors is an integer number (140457873).

Almost surely, 2^561065321 is an apocalyptic number.

It is an amenable number.

561065321 is a deficient number, since it is larger than the sum of its proper divisors (766171).

561065321 is an equidigital number, since it uses as much as digits as its factorization.

561065321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766170.

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

The square root of 561065321 is about 23686.8174519077. The cubic root of 561065321 is about 824.7794064639.

The spelling of 561065321 in words is "five hundred sixty-one million, sixty-five thousand, three hundred twenty-one".