123544312231 has 4 divisors (see below), whose sum is σ = 123545286000. Its totient is φ = 123543338464.

The previous prime is 123544312223. The next prime is 123544312277. The reversal of 123544312231 is 132213445321.

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: 132213445321 = 40763 ⋅3243467.

It is a cyclic number.

It is not a de Polignac number, because 123544312231 - 2³ = 123544312223 is a prime.

It is a super-2 number, since 2×123544312231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123544312193 and 123544312202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123544312531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261931 + ... + 561868.

It is an arithmetic number, because the mean of its divisors is an integer number (30886321500).

Almost surely, 2^123544312231 is an apocalyptic number.

123544312231 is a deficient number, since it is larger than the sum of its proper divisors (973769).

123544312231 is an equidigital number, since it uses as much as digits as its factorization.

123544312231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973768.

The product of its digits is 17280, while the sum is 31.

Adding to 123544312231 its reverse (132213445321), we get a palindrome (255757757552).

The spelling of 123544312231 in words is "one hundred twenty-three billion, five hundred forty-four million, three hundred twelve thousand, two hundred thirty-one".