123718813 has 2 divisors, whose sum is σ = 123718814. Its totient is φ = 123718812.

The previous prime is 123718753. The next prime is 123718871. The reversal of 123718813 is 318817321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70107129 + 53611684 = 8373^2 + 7322^2 .

It is a cyclic number.

It is not a de Polignac number, because 123718813 - 2²⁵ = 90164381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123718883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61859406 + 61859407.

It is an arithmetic number, because the mean of its divisors is an integer number (61859407).

Almost surely, 2^123718813 is an apocalyptic number.

It is an amenable number.

123718813 is a deficient number, since it is larger than the sum of its proper divisors (1).

123718813 is an equidigital number, since it uses as much as digits as its factorization.

123718813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 123718813 is about 11122.8958909090. The cubic root of 123718813 is about 498.2858809738.

The spelling of 123718813 in words is "one hundred twenty-three million, seven hundred eighteen thousand, eight hundred thirteen".