123312431 has 12 divisors (see below), whose sum is σ = 135972816. Its totient is φ = 111745920.

The previous prime is 123312421. The next prime is 123312473. The reversal of 123312431 is 134213321.

It is not a de Polignac number, because 123312431 - 2¹⁸ = 123050287 is a prime.

It is a super-2 number, since 2×123312431² = 30411911278259522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123312421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41270 + ... + 44156.

It is an arithmetic number, because the mean of its divisors is an integer number (11331068).

Almost surely, 2^123312431 is an apocalyptic number.

123312431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123312431 is a deficient number, since it is larger than the sum of its proper divisors (12660385).

123312431 is a wasteful number, since it uses less digits than its factorization.

123312431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3262 (or 3251 counting only the distinct ones).

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

The square root of 123312431 is about 11104.6130504399. The cubic root of 123312431 is about 497.7397055348.

Adding to 123312431 its reverse (134213321), we get a palindrome (257525752).

The spelling of 123312431 in words is "one hundred twenty-three million, three hundred twelve thousand, four hundred thirty-one".