1311311111 has 8 divisors (see below), whose sum is σ = 1430817024. Its totient is φ = 1191854520.

The previous prime is 1311311081. The next prime is 1311311143. The reversal of 1311311111 is 1111131131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311311111 - 2¹⁰ = 1311310087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311311161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63656 + ... + 81698.

It is an arithmetic number, because the mean of its divisors is an integer number (178852128).

Almost surely, 2^1311311111 is an apocalyptic number.

1311311111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1311311111 is a deficient number, since it is larger than the sum of its proper divisors (119505913).

1311311111 is a wasteful number, since it uses less digits than its factorization.

1311311111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24661.

The product of its digits is 9, while the sum is 14.

The square root of 1311311111 is about 36212.0299210083. The cubic root of 1311311111 is about 1094.5490970321.

Adding to 1311311111 its reverse (1111131131), we get a palindrome (2422442242).

It can be divided in two parts, 131131 and 1111, that multiplied together give a palindrome (145686541).

The spelling of 1311311111 in words is "one billion, three hundred eleven million, three hundred eleven thousand, one hundred eleven".