9994400813 has 2 divisors, whose sum is σ = 9994400814. Its totient is φ = 9994400812.

The previous prime is 9994400771. The next prime is 9994400821. The reversal of 9994400813 is 3180044999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7423200964 + 2571199849 = 86158^2 + 50707^2 .

It is a cyclic number.

It is not a de Polignac number, because 9994400813 - 2¹⁶ = 9994335277 is a prime.

It is a super-2 number, since 2×9994400813² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9994430813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4997200406 + 4997200407.

It is an arithmetic number, because the mean of its divisors is an integer number (4997200407).

Almost surely, 2^9994400813 is an apocalyptic number.

It is an amenable number.

9994400813 is a deficient number, since it is larger than the sum of its proper divisors (1).

9994400813 is an equidigital number, since it uses as much as digits as its factorization.

9994400813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 9994400813 is about 99972.0001450406. Note that the first 3 decimals coincide. The cubic root of 9994400813 is about 2154.0325122033.

The spelling of 9994400813 in words is "nine billion, nine hundred ninety-four million, four hundred thousand, eight hundred thirteen".