1311689789 has 2 divisors, whose sum is σ = 1311689790. Its totient is φ = 1311689788.

The previous prime is 1311689783. The next prime is 1311689831. The reversal of 1311689789 is 9879861131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1015505689 + 296184100 = 31867^2 + 17210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311689789 - 2⁴ = 1311689773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311689789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311689783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655844894 + 655844895.

It is an arithmetic number, because the mean of its divisors is an integer number (655844895).

Almost surely, 2^1311689789 is an apocalyptic number.

It is an amenable number.

1311689789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311689789 is an equidigital number, since it uses as much as digits as its factorization.

1311689789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 53.

The square root of 1311689789 is about 36217.2581651345. The cubic root of 1311689789 is about 1094.6544475138.

The spelling of 1311689789 in words is "one billion, three hundred eleven million, six hundred eighty-nine thousand, seven hundred eighty-nine".