561518887 has 2 divisors, whose sum is σ = 561518888. Its totient is φ = 561518886.

The previous prime is 561518879. The next prime is 561518911. The reversal of 561518887 is 788815165.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561518887 - 2³ = 561518879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561518887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561516887) 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, 280759443 + 280759444.

It is an arithmetic number, because the mean of its divisors is an integer number (280759444).

Almost surely, 2^561518887 is an apocalyptic number.

561518887 is a deficient number, since it is larger than the sum of its proper divisors (1).

561518887 is an equidigital number, since it uses as much as digits as its factorization.

561518887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 537600, while the sum is 49.

The square root of 561518887 is about 23696.3897461196. The cubic root of 561518887 is about 825.0015975482.

The spelling of 561518887 in words is "five hundred sixty-one million, five hundred eighteen thousand, eight hundred eighty-seven".