13788991789 has 2 divisors, whose sum is σ = 13788991790. Its totient is φ = 13788991788.

The previous prime is 13788991757. The next prime is 13788991813. The reversal of 13788991789 is 98719988731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10396861225 + 3392130564 = 101965^2 + 58242^2 .

It is a cyclic number.

It is not a de Polignac number, because 13788991789 - 2⁵ = 13788991757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13788991709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6894495894 + 6894495895.

It is an arithmetic number, because the mean of its divisors is an integer number (6894495895).

Almost surely, 2^13788991789 is an apocalyptic number.

It is an amenable number.

13788991789 is a deficient number, since it is larger than the sum of its proper divisors (1).

13788991789 is an equidigital number, since it uses as much as digits as its factorization.

13788991789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54867456, while the sum is 70.

The spelling of 13788991789 in words is "thirteen billion, seven hundred eighty-eight million, nine hundred ninety-one thousand, seven hundred eighty-nine".