561603111 has 8 divisors (see below), whose sum is σ = 749276544. Its totient is φ = 374165880.

The previous prime is 561603103. The next prime is 561603137. The reversal of 561603111 is 111306165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 561603111 - 2³ = 561603103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561603101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53425 + ... + 63066.

It is an arithmetic number, because the mean of its divisors is an integer number (93659568).

Almost surely, 2^561603111 is an apocalyptic number.

561603111 is a deficient number, since it is larger than the sum of its proper divisors (187673433).

561603111 is a wasteful number, since it uses less digits than its factorization.

561603111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118101.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 561603111 is about 23698.1668278371. The cubic root of 561603111 is about 825.0428436887.

Adding to 561603111 its reverse (111306165), we get a palindrome (672909276).

The spelling of 561603111 in words is "five hundred sixty-one million, six hundred three thousand, one hundred eleven".