561599365 has 4 divisors (see below), whose sum is σ = 673919244. Its totient is φ = 449279488.

The previous prime is 561599341. The next prime is 561599377. The reversal of 561599365 is 563995165.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 563995165 = 5 ⋅112799033.

It can be written as a sum of positive squares in 2 ways, for example, as 393585921 + 168013444 = 19839^2 + 12962^2 .

It is a cyclic number.

It is not a de Polignac number, because 561599365 - 2⁵ = 561599333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56159932 + ... + 56159941.

It is an arithmetic number, because the mean of its divisors is an integer number (168479811).

Almost surely, 2^561599365 is an apocalyptic number.

It is an amenable number.

561599365 is a deficient number, since it is larger than the sum of its proper divisors (112319879).

561599365 is a wasteful number, since it uses less digits than its factorization.

561599365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112319878.

The product of its digits is 1093500, while the sum is 49.

The square root of 561599365 is about 23698.0877920561. The cubic root of 561599365 is about 825.0410092868.

The spelling of 561599365 in words is "five hundred sixty-one million, five hundred ninety-nine thousand, three hundred sixty-five".