123995813 has 2 divisors, whose sum is σ = 123995814. Its totient is φ = 123995812.

The previous prime is 123995797. The next prime is 123995857. The reversal of 123995813 is 318599321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117115684 + 6880129 = 10822^2 + 2623^2 .

It is an emirp because it is prime and its reverse (318599321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123995813 - 2⁴ = 123995797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123995873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61997906 + 61997907.

It is an arithmetic number, because the mean of its divisors is an integer number (61997907).

Almost surely, 2^123995813 is an apocalyptic number.

It is an amenable number.

123995813 is a deficient number, since it is larger than the sum of its proper divisors (1).

123995813 is an equidigital number, since it uses as much as digits as its factorization.

123995813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 41.

The square root of 123995813 is about 11135.3407222231. The cubic root of 123995813 is about 498.6574825199.

The spelling of 123995813 in words is "one hundred twenty-three million, nine hundred ninety-five thousand, eight hundred thirteen".