561567767 has 4 divisors (see below), whose sum is σ = 562039680. Its totient is φ = 561095856.

The previous prime is 561567761. The next prime is 561567827. The reversal of 561567767 is 767765165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561567767 - 2⁴ = 561567751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561567761) 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, 234167 + ... + 236552.

It is an arithmetic number, because the mean of its divisors is an integer number (140509920).

Almost surely, 2^561567767 is an apocalyptic number.

561567767 is a deficient number, since it is larger than the sum of its proper divisors (471913).

561567767 is a wasteful number, since it uses less digits than its factorization.

561567767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471912.

The product of its digits is 1852200, while the sum is 50.

The square root of 561567767 is about 23697.4211044156. The cubic root of 561567767 is about 825.0255355426.

The spelling of 561567767 in words is "five hundred sixty-one million, five hundred sixty-seven thousand, seven hundred sixty-seven".