123530728103 has 4 divisors (see below), whose sum is σ = 123531657648. Its totient is φ = 123529798560.

The previous prime is 123530728093. The next prime is 123530728121. The reversal of 123530728103 is 301827035321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 301827035321 = 7 ⋅43118147903.

It is a cyclic number.

It is not a de Polignac number, because 123530728103 - 2²⁰ = 123529679527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123530728303) 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, 223778 + ... + 545103.

It is an arithmetic number, because the mean of its divisors is an integer number (30882914412).

Almost surely, 2^123530728103 is an apocalyptic number.

123530728103 is a deficient number, since it is larger than the sum of its proper divisors (929545).

123530728103 is an equidigital number, since it uses as much as digits as its factorization.

123530728103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929544.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 123530728103 in words is "one hundred twenty-three billion, five hundred thirty million, seven hundred twenty-eight thousand, one hundred three".