123131231223 has 144 divisors (see below), whose sum is σ = 233947996416. Its totient is φ = 55929968640.

The previous prime is 123131231219. The next prime is 123131231243. The reversal of 123131231223 is 322132131321.

It is not a de Polignac number, because 123131231223 - 2² = 123131231219 is a prime.

It is a super-2 number, since 2×123131231223² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123131231193 and 123131231202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131231243) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 14088711 + ... + 14097447.

It is an arithmetic number, because the mean of its divisors is an integer number (1624638864).

Almost surely, 2^123131231223 is an apocalyptic number.

123131231223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

123131231223 is a deficient number, since it is larger than the sum of its proper divisors (110816765193).

123131231223 is a wasteful number, since it uses less digits than its factorization.

123131231223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8822 (or 8790 counting only the distinct ones).

The product of its digits is 1296, while the sum is 24.

Adding to 123131231223 its reverse (322132131321), we get a palindrome (445263362544).

The spelling of 123131231223 in words is "one hundred twenty-three billion, one hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty-three".