123642331 has 2 divisors, whose sum is σ = 123642332. Its totient is φ = 123642330.

The previous prime is 123642317. The next prime is 123642359. The reversal of 123642331 is 133246321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123642331 - 2⁷ = 123642203 is a prime.

It is a super-2 number, since 2×123642331² = 30574852030227122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123642296 and 123642305.

It is not a weakly prime, because it can be changed into another prime (123642301) 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 as a sum of consecutive naturals, namely, 61821165 + 61821166.

It is an arithmetic number, because the mean of its divisors is an integer number (61821166).

Almost surely, 2^123642331 is an apocalyptic number.

123642331 is a deficient number, since it is larger than the sum of its proper divisors (1).

123642331 is an equidigital number, since it uses as much as digits as its factorization.

123642331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 25.

The square root of 123642331 is about 11119.4573158945. The cubic root of 123642331 is about 498.1831810001.

Adding to 123642331 its reverse (133246321), we get a palindrome (256888652).

The spelling of 123642331 in words is "one hundred twenty-three million, six hundred forty-two thousand, three hundred thirty-one".