561217623 has 16 divisors (see below), whose sum is σ = 758827776. Its totient is φ = 368913600.

The previous prime is 561217597. The next prime is 561217627. The reversal of 561217623 is 326712165.

It is not a de Polignac number, because 561217623 - 2¹⁰ = 561216599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561217627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57540 + ... + 66582.

It is an arithmetic number, because the mean of its divisors is an integer number (47426736).

Almost surely, 2^561217623 is an apocalyptic number.

561217623 is a deficient number, since it is larger than the sum of its proper divisors (197610153).

561217623 is a wasteful number, since it uses less digits than its factorization.

561217623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9334.

The product of its digits is 15120, while the sum is 33.

The square root of 561217623 is about 23690.0321443429. The cubic root of 561217623 is about 824.8540289033.

Adding to 561217623 its reverse (326712165), we get a palindrome (887929788).

The spelling of 561217623 in words is "five hundred sixty-one million, two hundred seventeen thousand, six hundred twenty-three".