561268613 has 2 divisors, whose sum is σ = 561268614. Its totient is φ = 561268612.

The previous prime is 561268601. The next prime is 561268657. The reversal of 561268613 is 316862165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547887649 + 13380964 = 23407^2 + 3658^2 .

It is a cyclic number.

It is not a de Polignac number, because 561268613 - 2⁴ = 561268597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561265613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280634306 + 280634307.

It is an arithmetic number, because the mean of its divisors is an integer number (280634307).

Almost surely, 2^561268613 is an apocalyptic number.

It is an amenable number.

561268613 is a deficient number, since it is larger than the sum of its proper divisors (1).

561268613 is an equidigital number, since it uses as much as digits as its factorization.

561268613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 561268613 is about 23691.1083109254. The cubic root of 561268613 is about 824.8790091317.

The spelling of 561268613 in words is "five hundred sixty-one million, two hundred sixty-eight thousand, six hundred thirteen".