100123 has 4 divisors (see below), whose sum is σ = 101880. Its totient is φ = 98368.

The previous prime is 100109. The next prime is 100129. The reversal of 100123 is 321001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321001 = 29 ⋅11069.

It is a cyclic number.

It is not a de Polignac number, because 100123 - 2⁹ = 99611 is a prime.

It is a Duffinian number.

100123 is a modest number, since divided by 123 gives 1 as remainder.

100123 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (100129) 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, 790 + ... + 907.

It is an arithmetic number, because the mean of its divisors is an integer number (25470).

2¹⁰⁰¹²³ is an apocalyptic number.

100123 is a deficient number, since it is larger than the sum of its proper divisors (1757).

100123 is an equidigital number, since it uses as much as digits as its factorization.

100123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 100123 is about 316.4221863271. The cubic root of 100123 is about 46.4349110532.

Adding to 100123 its reverse (321001), we get a palindrome (421124).

It can be divided in two parts, 1001 and 23, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 100123 in words is "one hundred thousand, one hundred twenty-three", and thus it is an iban number.