7128507289 has 2 divisors, whose sum is σ = 7128507290. Its totient is φ = 7128507288.

The previous prime is 7128507247. The next prime is 7128507293. The reversal of 7128507289 is 9827058217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5668885264 + 1459622025 = 75292^2 + 38205^2 .

It is an emirp because it is prime and its reverse (9827058217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7128507289 - 2⁷ = 7128507161 is a prime.

It is a super-2 number, since 2×7128507289² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7128507299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3564253644 + 3564253645.

It is an arithmetic number, because the mean of its divisors is an integer number (3564253645).

Almost surely, 2^7128507289 is an apocalyptic number.

It is an amenable number.

7128507289 is a deficient number, since it is larger than the sum of its proper divisors (1).

7128507289 is an equidigital number, since it uses as much as digits as its factorization.

7128507289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 49.

The square root of 7128507289 is about 84430.4879116543. The cubic root of 7128507289 is about 1924.5662519897.

The spelling of 7128507289 in words is "seven billion, one hundred twenty-eight million, five hundred seven thousand, two hundred eighty-nine".