1311011305 has 32 divisors (see below), whose sum is σ = 1700582400. Its totient is φ = 967038912.

The previous prime is 1311011291. The next prime is 1311011353. The reversal of 1311011305 is 5031101131.

It is a cyclic number.

It is not a de Polignac number, because 1311011305 - 2¹¹ = 1311009257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1989066 + ... + 1989724.

It is an arithmetic number, because the mean of its divisors is an integer number (53143200).

Almost surely, 2^1311011305 is an apocalyptic number.

It is an amenable number.

1311011305 is a deficient number, since it is larger than the sum of its proper divisors (389571095).

1311011305 is a wasteful number, since it uses less digits than its factorization.

1311011305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213.

The product of its (nonzero) digits is 45, while the sum is 16.

The square root of 1311011305 is about 36207.8900931827. The cubic root of 1311011305 is about 1094.4656748258.

Adding to 1311011305 its reverse (5031101131), we get a palindrome (6342112436).

The spelling of 1311011305 in words is "one billion, three hundred eleven million, eleven thousand, three hundred five".