561240065 has 4 divisors (see below), whose sum is σ = 673488084. Its totient is φ = 448992048.

The previous prime is 561240061. The next prime is 561240083. The reversal of 561240065 is 560042165.

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 418939024 + 142301041 = 20468^2 + 11929^2 .

It is a cyclic number.

It is not a de Polignac number, because 561240065 - 2² = 561240061 is a prime.

It is a super-2 number, since 2×561240065² = 629980821122408450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561240061) 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, 56124002 + ... + 56124011.

It is an arithmetic number, because the mean of its divisors is an integer number (168372021).

Almost surely, 2^561240065 is an apocalyptic number.

It is an amenable number.

561240065 is a deficient number, since it is larger than the sum of its proper divisors (112248019).

561240065 is a wasteful number, since it uses less digits than its factorization.

561240065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112248018.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 561240065 is about 23690.5057987372. The cubic root of 561240065 is about 824.8650235256.

The spelling of 561240065 in words is "five hundred sixty-one million, two hundred forty thousand, sixty-five".