1311751729 has 2 divisors, whose sum is σ = 1311751730. Its totient is φ = 1311751728.

The previous prime is 1311751711. The next prime is 1311751733. The reversal of 1311751729 is 9271571131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1264513600 + 47238129 = 35560^2 + 6873^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311751729 - 2¹⁷ = 1311620657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311751769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655875864 + 655875865.

It is an arithmetic number, because the mean of its divisors is an integer number (655875865).

Almost surely, 2^1311751729 is an apocalyptic number.

It is an amenable number.

1311751729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311751729 is an equidigital number, since it uses as much as digits as its factorization.

1311751729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230, while the sum is 37.

The square root of 1311751729 is about 36218.1132722289. The cubic root of 1311751729 is about 1094.6716776623.

It can be divided in two parts, 13117 and 51729, that added together give a palindrome (64846).

The spelling of 1311751729 in words is "one billion, three hundred eleven million, seven hundred fifty-one thousand, seven hundred twenty-nine".