9938999813 has 2 divisors, whose sum is σ = 9938999814. Its totient is φ = 9938999812.

The previous prime is 9938999773. The next prime is 9938999849. The reversal of 9938999813 is 3189998399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7747168324 + 2191831489 = 88018^2 + 46817^2 .

It is a cyclic number.

It is not a de Polignac number, because 9938999813 - 2¹⁶ = 9938934277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9938929813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4969499906 + 4969499907.

It is an arithmetic number, because the mean of its divisors is an integer number (4969499907).

Almost surely, 2^9938999813 is an apocalyptic number.

It is an amenable number.

9938999813 is a deficient number, since it is larger than the sum of its proper divisors (1).

9938999813 is an equidigital number, since it uses as much as digits as its factorization.

9938999813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34012224, while the sum is 68.

The square root of 9938999813 is about 99694.5325130721. The cubic root of 9938999813 is about 2150.0450549780.

The spelling of 9938999813 in words is "nine billion, nine hundred thirty-eight million, nine hundred ninety-nine thousand, eight hundred thirteen".