1281317129 has 2 divisors, whose sum is σ = 1281317130. Its totient is φ = 1281317128.

The previous prime is 1281317087. The next prime is 1281317159. The reversal of 1281317129 is 9217131821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 862009600 + 419307529 = 29360^2 + 20477^2 .

It is an emirp because it is prime and its reverse (9217131821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1281317129 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1281317159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640658564 + 640658565.

It is an arithmetic number, because the mean of its divisors is an integer number (640658565).

Almost surely, 2^1281317129 is an apocalyptic number.

It is an amenable number.

1281317129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281317129 is an equidigital number, since it uses as much as digits as its factorization.

1281317129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 35.

The square root of 1281317129 is about 35795.4903444554. The cubic root of 1281317129 is about 1086.1393396115.

The spelling of 1281317129 in words is "one billion, two hundred eighty-one million, three hundred seventeen thousand, one hundred twenty-nine".