123131312243 has 4 divisors (see below), whose sum is σ = 123224524248. Its totient is φ = 123038100240.

The previous prime is 123131312219. The next prime is 123131312257. The reversal of 123131312243 is 342213131321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342213131321 = 6917 ⋅49474213.

It is a cyclic number.

It is not a de Polignac number, because 123131312243 - 2¹² = 123131308147 is a prime.

It is a super-2 number, since 2×123131312243² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123131315243) 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, 46604021 + ... + 46606662.

It is an arithmetic number, because the mean of its divisors is an integer number (30806131062).

Almost surely, 2^123131312243 is an apocalyptic number.

123131312243 is a deficient number, since it is larger than the sum of its proper divisors (93212005).

123131312243 is an equidigital number, since it uses as much as digits as its factorization.

123131312243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93212004.

The product of its digits is 2592, while the sum is 26.

Adding to 123131312243 its reverse (342213131321), we get a palindrome (465344443564).

The spelling of 123131312243 in words is "one hundred twenty-three billion, one hundred thirty-one million, three hundred twelve thousand, two hundred forty-three".