101243123 has 4 divisors (see below), whose sum is σ = 103397280. Its totient is φ = 99088968.

The previous prime is 101243101. The next prime is 101243159. The reversal of 101243123 is 321342101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321342101 = 1553 ⋅206917.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101243123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101243183) 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 3 ways as a sum of consecutive naturals, for example, 1077008 + ... + 1077101.

It is an arithmetic number, because the mean of its divisors is an integer number (25849320).

Almost surely, 2^101243123 is an apocalyptic number.

101243123 is a deficient number, since it is larger than the sum of its proper divisors (2154157).

101243123 is an equidigital number, since it uses as much as digits as its factorization.

101243123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154156.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 101243123 is about 10061.9641720690. The cubic root of 101243123 is about 466.0743233391.

Adding to 101243123 its reverse (321342101), we get a palindrome (422585224).

The spelling of 101243123 in words is "one hundred one million, two hundred forty-three thousand, one hundred twenty-three".