561568145 has 8 divisors (see below), whose sum is σ = 674028456. Its totient is φ = 449156736.

The previous prime is 561568087. The next prime is 561568153. The reversal of 561568145 is 541865165.

It can be written as a sum of positive squares in 4 ways, for example, as 124925329 + 436642816 = 11177^2 + 20896^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561568145 - 2⁶ = 561568081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21509 + ... + 39821.

It is an arithmetic number, because the mean of its divisors is an integer number (84253557).

Almost surely, 2^561568145 is an apocalyptic number.

It is an amenable number.

561568145 is a deficient number, since it is larger than the sum of its proper divisors (112460311).

561568145 is a wasteful number, since it uses less digits than its factorization.

561568145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24451.

The product of its digits is 144000, while the sum is 41.

The square root of 561568145 is about 23697.4290799656. The cubic root of 561568145 is about 825.0257206551.

The spelling of 561568145 in words is "five hundred sixty-one million, five hundred sixty-eight thousand, one hundred forty-five".