2138789449 has 2 divisors, whose sum is σ = 2138789450. Its totient is φ = 2138789448.

The previous prime is 2138789423. The next prime is 2138789453. The reversal of 2138789449 is 9449878312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1456796224 + 681993225 = 38168^2 + 26115^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138789449 - 2⁹ = 2138788937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2138789449.

It is not a weakly prime, because it can be changed into another prime (2138709449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069394724 + 1069394725.

It is an arithmetic number, because the mean of its divisors is an integer number (1069394725).

Almost surely, 2^2138789449 is an apocalyptic number.

It is an amenable number.

2138789449 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138789449 is an equidigital number, since it uses as much as digits as its factorization.

2138789449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 55.

The square root of 2138789449 is about 46247.0480030888. The cubic root of 2138789449 is about 1288.4157080605.

The spelling of 2138789449 in words is "two billion, one hundred thirty-eight million, seven hundred eighty-nine thousand, four hundred forty-nine".