123116643 has 12 divisors (see below), whose sum is σ = 191514960. Its totient is φ = 75764016.

The previous prime is 123116597. The next prime is 123116647. The reversal of 123116643 is 346611321.

123116643 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 16 + 643 = 666.

It is not a de Polignac number, because 123116643 - 2⁸ = 123116387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123116647) 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, 526023 + ... + 526256.

It is an arithmetic number, because the mean of its divisors is an integer number (15959580).

Almost surely, 2^123116643 is an apocalyptic number.

123116643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

123116643 is a deficient number, since it is larger than the sum of its proper divisors (68398317).

123116643 is a wasteful number, since it uses less digits than its factorization.

123116643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052298 (or 1052295 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 123116643 is about 11095.7939328378. The cubic root of 123116643 is about 497.4761390204.

Adding to 123116643 its reverse (346611321), we get a palindrome (469727964).

The spelling of 123116643 in words is "one hundred twenty-three million, one hundred sixteen thousand, six hundred forty-three".