123312331 has 2 divisors, whose sum is σ = 123312332. Its totient is φ = 123312330.

The previous prime is 123312307. The next prime is 123312359. The reversal of 123312331 is 133213321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123312331 is a prime.

It is a super-2 number, since 2×123312331² = 30411861953307122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123312299 and 123312308.

It is not a weakly prime, because it can be changed into another prime (123312731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61656165 + 61656166.

It is an arithmetic number, because the mean of its divisors is an integer number (61656166).

Almost surely, 2^123312331 is an apocalyptic number.

123312331 is a deficient number, since it is larger than the sum of its proper divisors (1).

123312331 is an equidigital number, since it uses as much as digits as its factorization.

123312331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 19.

The square root of 123312331 is about 11104.6085478057. The cubic root of 123312331 is about 497.7395709877.

Adding to 123312331 its reverse (133213321), we get a palindrome (256525652).

The spelling of 123312331 in words is "one hundred twenty-three million, three hundred twelve thousand, three hundred thirty-one".