2689171489 has 2 divisors, whose sum is σ = 2689171490. Its totient is φ = 2689171488.

The previous prime is 2689171447. The next prime is 2689171501. The reversal of 2689171489 is 9841719862.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2554797025 + 134374464 = 50545^2 + 11592^2 .

It is a cyclic number.

It is not a de Polignac number, because 2689171489 - 2⁷ = 2689171361 is a prime.

It is not a weakly prime, because it can be changed into another prime (2689171439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1344585744 + 1344585745.

It is an arithmetic number, because the mean of its divisors is an integer number (1344585745).

Almost surely, 2^2689171489 is an apocalyptic number.

It is an amenable number.

2689171489 is a deficient number, since it is larger than the sum of its proper divisors (1).

2689171489 is an equidigital number, since it uses as much as digits as its factorization.

2689171489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 55.

The square root of 2689171489 is about 51857.2221488965. Note that the first 3 decimals coincide. The cubic root of 2689171489 is about 1390.6126190432.

The spelling of 2689171489 in words is "two billion, six hundred eighty-nine million, one hundred seventy-one thousand, four hundred eighty-nine".