100243123 has 4 divisors (see below), whose sum is σ = 100263528. Its totient is φ = 100222720.

The previous prime is 100243079. The next prime is 100243139. The reversal of 100243123 is 321342001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100243123 - 2¹³ = 100234931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100243097 and 100243106.

It is not an unprimeable number, because it can be changed into a prime (100243153) 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, 2163 + ... + 14323.

It is an arithmetic number, because the mean of its divisors is an integer number (25065882).

Almost surely, 2^100243123 is an apocalyptic number.

100243123 is a deficient number, since it is larger than the sum of its proper divisors (20405).

100243123 is an equidigital number, since it uses as much as digits as its factorization.

100243123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20404.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 100243123 is about 10012.1487703689. The cubic root of 100243123 is about 464.5347379300.

Adding to 100243123 its reverse (321342001), we get a palindrome (421585124).

The spelling of 100243123 in words is "one hundred million, two hundred forty-three thousand, one hundred twenty-three".