561265613 has 2 divisors, whose sum is σ = 561265614. Its totient is φ = 561265612.

The previous prime is 561265609. The next prime is 561265667. The reversal of 561265613 is 316562165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395293924 + 165971689 = 19882^2 + 12883^2 .

It is a cyclic number.

It is not a de Polignac number, because 561265613 - 2² = 561265609 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561265603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280632806 + 280632807.

It is an arithmetic number, because the mean of its divisors is an integer number (280632807).

Almost surely, 2^561265613 is an apocalyptic number.

It is an amenable number.

561265613 is a deficient number, since it is larger than the sum of its proper divisors (1).

561265613 is an equidigital number, since it uses as much as digits as its factorization.

561265613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

The square root of 561265613 is about 23691.0449959473. The cubic root of 561265613 is about 824.8775394602.

The spelling of 561265613 in words is "five hundred sixty-one million, two hundred sixty-five thousand, six hundred thirteen".