561106523 has 4 divisors (see below), whose sum is σ = 561262800. Its totient is φ = 560950248.

The previous prime is 561106519. The next prime is 561106549. The reversal of 561106523 is 325601165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325601165 = 5 ⋅65120233.

It is a cyclic number.

It is not a de Polignac number, because 561106523 - 2² = 561106519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561106223) 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, 72623 + ... + 79976.

It is an arithmetic number, because the mean of its divisors is an integer number (140315700).

Almost surely, 2^561106523 is an apocalyptic number.

561106523 is a deficient number, since it is larger than the sum of its proper divisors (156277).

561106523 is a wasteful number, since it uses less digits than its factorization.

561106523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156276.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 561106523 is about 23687.6871602105. The cubic root of 561106523 is about 824.7995952774.

Adding to 561106523 its reverse (325601165), we get a palindrome (886707688).

The spelling of 561106523 in words is "five hundred sixty-one million, one hundred six thousand, five hundred twenty-three".