561542623 has 8 divisors (see below), whose sum is σ = 596773440. Its totient is φ = 526556160.

The previous prime is 561542617. The next prime is 561542647. The reversal of 561542623 is 326245165.

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

It is a cyclic number.

It is not a de Polignac number, because 561542623 - 2⁵ = 561542591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561543623) 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, 56338 + ... + 65551.

It is an arithmetic number, because the mean of its divisors is an integer number (74596680).

Almost surely, 2^561542623 is an apocalyptic number.

561542623 is a deficient number, since it is larger than the sum of its proper divisors (35230817).

561542623 is a wasteful number, since it uses less digits than its factorization.

561542623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122177.

The product of its digits is 43200, while the sum is 34.

The square root of 561542623 is about 23696.8905766136. The cubic root of 561542623 is about 825.0132219491.

Adding to 561542623 its reverse (326245165), we get a palindrome (887787788).

The spelling of 561542623 in words is "five hundred sixty-one million, five hundred forty-two thousand, six hundred twenty-three".