561555767 has 2 divisors, whose sum is σ = 561555768. Its totient is φ = 561555766.

The previous prime is 561555737. The next prime is 561555817. The reversal of 561555767 is 767555165.

561555767 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561555767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561555707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280777883 + 280777884.

It is an arithmetic number, because the mean of its divisors is an integer number (280777884).

Almost surely, 2^561555767 is an apocalyptic number.

561555767 is a deficient number, since it is larger than the sum of its proper divisors (1).

561555767 is an equidigital number, since it uses as much as digits as its factorization.

561555767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102500, while the sum is 47.

The square root of 561555767 is about 23697.1679109551. The cubic root of 561555767 is about 825.0196589132.

The spelling of 561555767 in words is "five hundred sixty-one million, five hundred fifty-five thousand, seven hundred sixty-seven".