1238713813 has 2 divisors, whose sum is σ = 1238713814. Its totient is φ = 1238713812.

The previous prime is 1238713769. The next prime is 1238713849. The reversal of 1238713813 is 3183178321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1198682884 + 40030929 = 34622^2 + 6327^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238713813 - 2²⁹ = 701842901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1238710813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619356906 + 619356907.

It is an arithmetic number, because the mean of its divisors is an integer number (619356907).

Almost surely, 2^1238713813 is an apocalyptic number.

It is an amenable number.

1238713813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238713813 is an equidigital number, since it uses as much as digits as its factorization.

1238713813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 1238713813 is about 35195.3663569510. The cubic root of 1238713813 is about 1073.9654913101.

The spelling of 1238713813 in words is "one billion, two hundred thirty-eight million, seven hundred thirteen thousand, eight hundred thirteen".