1319128717 has 2 divisors, whose sum is σ = 1319128718. Its totient is φ = 1319128716.

The previous prime is 1319128697. The next prime is 1319128739. The reversal of 1319128717 is 7178219131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1306533316 + 12595401 = 36146^2 + 3549^2 .

It is an emirp because it is prime and its reverse (7178219131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1319128717 - 2⁷ = 1319128589 is a prime.

It is a super-3 number, since 3×1319128717³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1319128717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1319128777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659564358 + 659564359.

It is an arithmetic number, because the mean of its divisors is an integer number (659564359).

Almost surely, 2^1319128717 is an apocalyptic number.

It is an amenable number.

1319128717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1319128717 is an equidigital number, since it uses as much as digits as its factorization.

1319128717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 40.

The square root of 1319128717 is about 36319.8116322208. The cubic root of 1319128717 is about 1096.7199028838.

The spelling of 1319128717 in words is "one billion, three hundred nineteen million, one hundred twenty-eight thousand, seven hundred seventeen".