2109988447769 has 2 divisors, whose sum is σ = 2109988447770. Its totient is φ = 2109988447768.

The previous prime is 2109988447691. The next prime is 2109988447771. The reversal of 2109988447769 is 9677448899012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1782323791369 + 327664656400 = 1335037^2 + 572420^2 .

It is a cyclic number.

It is not a de Polignac number, because 2109988447769 - 2²⁴ = 2109971670553 is a prime.

It is a super-2 number, since 2×2109988447769² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 2109988447771, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2109988447696 and 2109988447705.

It is not a weakly prime, because it can be changed into another prime (2109988447069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054994223884 + 1054994223885.

It is an arithmetic number, because the mean of its divisors is an integer number (1054994223885).

Almost surely, 2^{2109988447769} is an apocalyptic number.

It is an amenable number.

2109988447769 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109988447769 is an equidigital number, since it uses as much as digits as its factorization.

2109988447769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 438939648, while the sum is 74.

The spelling of 2109988447769 in words is "two trillion, one hundred nine billion, nine hundred eighty-eight million, four hundred forty-seven thousand, seven hundred sixty-nine".