561055559 has 4 divisors (see below), whose sum is σ = 563052480. Its totient is φ = 559058640.

The previous prime is 561055553. The next prime is 561055567. The reversal of 561055559 is 955550165.

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 561055559 - 2²⁸ = 292620103 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 (561055553) 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 in 3 ways as a sum of consecutive naturals, for example, 998039 + ... + 998600.

It is an arithmetic number, because the mean of its divisors is an integer number (140763120).

Almost surely, 2^561055559 is an apocalyptic number.

561055559 is a deficient number, since it is larger than the sum of its proper divisors (1996921).

561055559 is a wasteful number, since it uses less digits than its factorization.

561055559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996920.

The product of its (nonzero) digits is 168750, while the sum is 41.

The square root of 561055559 is about 23686.6113870262. The cubic root of 561055559 is about 824.7746229785.

The spelling of 561055559 in words is "five hundred sixty-one million, fifty-five thousand, five hundred fifty-nine".