123120563 has 4 divisors (see below), whose sum is σ = 123247560. Its totient is φ = 122993568.

The previous prime is 123120539. The next prime is 123120577. The reversal of 123120563 is 365021321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365021321 = 7 ⋅52145903.

It is a cyclic number.

It is not a de Polignac number, because 123120563 - 2¹⁰ = 123119539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123120523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62033 + ... + 63986.

It is an arithmetic number, because the mean of its divisors is an integer number (30811890).

Almost surely, 2^123120563 is an apocalyptic number.

123120563 is a deficient number, since it is larger than the sum of its proper divisors (126997).

123120563 is an equidigital number, since it uses as much as digits as its factorization.

123120563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126996.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 123120563 is about 11095.9705749430. The cubic root of 123120563 is about 497.4814187988.

Adding to 123120563 its reverse (365021321), we get a palindrome (488141884).

The spelling of 123120563 in words is "one hundred twenty-three million, one hundred twenty thousand, five hundred sixty-three".