561125855 has 4 divisors (see below), whose sum is σ = 673351032. Its totient is φ = 448900680.

The previous prime is 561125827. The next prime is 561125867. The reversal of 561125855 is 558521165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 558521165 = 5 ⋅111704233.

It is not a de Polignac number, because 561125855 - 2²⁴ = 544348639 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 3 ways as a sum of consecutive naturals, for example, 56112581 + ... + 56112590.

It is an arithmetic number, because the mean of its divisors is an integer number (168337758).

Almost surely, 2^561125855 is an apocalyptic number.

561125855 is a deficient number, since it is larger than the sum of its proper divisors (112225177).

561125855 is a wasteful number, since it uses less digits than its factorization.

561125855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112225176.

The product of its digits is 60000, while the sum is 38.

The square root of 561125855 is about 23688.0952167961. The cubic root of 561125855 is about 824.8090675386.

The spelling of 561125855 in words is "five hundred sixty-one million, one hundred twenty-five thousand, eight hundred fifty-five".