565721073 has 6 divisors (see below), whose sum is σ = 817152674. Its totient is φ = 377147376.

The previous prime is 565721071. The next prime is 565721089. The reversal of 565721073 is 370127565.

565721073 is a `hidden beast` number, since 5 + 6 + 572 + 10 + 73 = 666.

It can be written as a sum of positive squares in only one way, i.e., 565107984 + 613089 = 23772^2 + 783^2 .

It is not a de Polignac number, because 565721073 - 2¹ = 565721071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (565721071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31428940 + ... + 31428957.

Almost surely, 2^565721073 is an apocalyptic number.

It is an amenable number.

565721073 is a deficient number, since it is larger than the sum of its proper divisors (251431601).

565721073 is a wasteful number, since it uses less digits than its factorization.

565721073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62857903 (or 62857900 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 36.

The square root of 565721073 is about 23784.8916962008. The cubic root of 565721073 is about 827.0544806239.

The spelling of 565721073 in words is "five hundred sixty-five million, seven hundred twenty-one thousand, seventy-three".