2681657789 has 2 divisors, whose sum is σ = 2681657790. Its totient is φ = 2681657788.

The previous prime is 2681657749. The next prime is 2681657857. The reversal of 2681657789 is 9877561862.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2667722500 + 13935289 = 51650^2 + 3733^2 .

It is a cyclic number.

It is not a de Polignac number, because 2681657789 - 2²⁰ = 2680609213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2681657729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340828894 + 1340828895.

It is an arithmetic number, because the mean of its divisors is an integer number (1340828895).

Almost surely, 2^2681657789 is an apocalyptic number.

It is an amenable number.

2681657789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2681657789 is an equidigital number, since it uses as much as digits as its factorization.

2681657789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 59.

The square root of 2681657789 is about 51784.7254410024. The cubic root of 2681657789 is about 1389.3162603463.

The spelling of 2681657789 in words is "two billion, six hundred eighty-one million, six hundred fifty-seven thousand, seven hundred eighty-nine".