1311056311 has 4 divisors (see below), whose sum is σ = 1311134824. Its totient is φ = 1310977800.

The previous prime is 1311056239. The next prime is 1311056317. The reversal of 1311056311 is 1136501131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1136501131 = 19 ⋅59815849.

It is a cyclic number.

It is not a de Polignac number, because 1311056311 - 2¹³ = 1311048119 is a prime.

It is a super-2 number, since 2×1311056311² = 3437737301225857442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311056317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3120 + ... + 51301.

It is an arithmetic number, because the mean of its divisors is an integer number (327783706).

Almost surely, 2^1311056311 is an apocalyptic number.

1311056311 is a deficient number, since it is larger than the sum of its proper divisors (78513).

1311056311 is an equidigital number, since it uses as much as digits as its factorization.

1311056311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78512.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 1311056311 is about 36208.5115822233. The cubic root of 1311056311 is about 1094.4781987347.

Adding to 1311056311 its reverse (1136501131), we get a palindrome (2447557442).

The spelling of 1311056311 in words is "one billion, three hundred eleven million, fifty-six thousand, three hundred eleven".