561109775 has 6 divisors (see below), whose sum is σ = 695776152. Its totient is φ = 448887800.

The previous prime is 561109763. The next prime is 561109799. The reversal of 561109775 is 577901165.

It is not a de Polignac number, because 561109775 - 2¹⁴ = 561093391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11222171 + ... + 11222220.

It is an arithmetic number, because the mean of its divisors is an integer number (115962692).

Almost surely, 2^561109775 is an apocalyptic number.

561109775 is a deficient number, since it is larger than the sum of its proper divisors (134666377).

561109775 is a wasteful number, since it uses less digits than its factorization.

561109775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22444401 (or 22444396 counting only the distinct ones).

The product of its (nonzero) digits is 66150, while the sum is 41.

The square root of 561109775 is about 23687.7558033681. The cubic root of 561109775 is about 824.8011887021.

The spelling of 561109775 in words is "five hundred sixty-one million, one hundred nine thousand, seven hundred seventy-five".