1311509783 has 2 divisors, whose sum is σ = 1311509784. Its totient is φ = 1311509782.

The previous prime is 1311509779. The next prime is 1311509813. The reversal of 1311509783 is 3879051131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311509783 - 2² = 1311509779 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311569783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655754891 + 655754892.

It is an arithmetic number, because the mean of its divisors is an integer number (655754892).

Almost surely, 2^1311509783 is an apocalyptic number.

1311509783 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311509783 is an equidigital number, since it uses as much as digits as its factorization.

1311509783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 1311509783 is about 36214.7729939040. The cubic root of 1311509783 is about 1094.6043712980.

The spelling of 1311509783 in words is "one billion, three hundred eleven million, five hundred nine thousand, seven hundred eighty-three".