123116813 has 4 divisors (see below), whose sum is σ = 124056768. Its totient is φ = 122176860.

The previous prime is 123116801. The next prime is 123116821. The reversal of 123116813 is 318611321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 318611321 = 7 ⋅45515903.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123116813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123116843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469781 + ... + 470042.

It is an arithmetic number, because the mean of its divisors is an integer number (31014192).

Almost surely, 2^123116813 is an apocalyptic number.

It is an amenable number.

123116813 is a deficient number, since it is larger than the sum of its proper divisors (939955).

123116813 is an equidigital number, since it uses as much as digits as its factorization.

123116813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939954.

The product of its digits is 864, while the sum is 26.

The square root of 123116813 is about 11095.8015933956. The cubic root of 123116813 is about 497.4763679927.

The spelling of 123116813 in words is "one hundred twenty-three million, one hundred sixteen thousand, eight hundred thirteen".