561016111 has 4 divisors (see below), whose sum is σ = 572952672. Its totient is φ = 549079552.

The previous prime is 561016103. The next prime is 561016117. The reversal of 561016111 is 111610165.

561016111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111610165 = 5 ⋅22322033.

It is a cyclic number.

It is not a de Polignac number, because 561016111 - 2³ = 561016103 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 (561016117) 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, 5968210 + ... + 5968303.

It is an arithmetic number, because the mean of its divisors is an integer number (143238168).

Almost surely, 2^561016111 is an apocalyptic number.

561016111 is a deficient number, since it is larger than the sum of its proper divisors (11936561).

561016111 is a wasteful number, since it uses less digits than its factorization.

561016111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11936560.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 561016111 is about 23685.7786656888. The cubic root of 561016111 is about 824.7552924676.

Adding to 561016111 its reverse (111610165), we get a palindrome (672626276).

The spelling of 561016111 in words is "five hundred sixty-one million, sixteen thousand, one hundred eleven".