123131423 has 4 divisors (see below), whose sum is σ = 124350648. Its totient is φ = 121912200.

The previous prime is 123131417. The next prime is 123131429. The reversal of 123131423 is 324131321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324131321 = 101 ⋅3209221.

It is an interprime number because it is at equal distance from previous prime (123131417) and next prime (123131429).

It is a cyclic number.

It is not a de Polignac number, because 123131423 - 2¹² = 123127327 is a prime.

It is a super-2 number, since 2×123131423² = 30322694660009858, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123131395 and 123131404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131429) 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, 609461 + ... + 609662.

It is an arithmetic number, because the mean of its divisors is an integer number (31087662).

Almost surely, 2^123131423 is an apocalyptic number.

123131423 is a deficient number, since it is larger than the sum of its proper divisors (1219225).

123131423 is a wasteful number, since it uses less digits than its factorization.

123131423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219224.

The product of its digits is 432, while the sum is 20.

The square root of 123131423 is about 11096.4599309870. The cubic root of 123131423 is about 497.4960453546.

Adding to 123131423 its reverse (324131321), we get a palindrome (447262744).

The spelling of 123131423 in words is "one hundred twenty-three million, one hundred thirty-one thousand, four hundred twenty-three".