1311688443 has 32 divisors (see below), whose sum is σ = 1940335936. Its totient is φ = 782949888.

The previous prime is 1311688423. The next prime is 1311688447. The reversal of 1311688443 is 3448861131.

It is not a de Polignac number, because 1311688443 - 2⁹ = 1311687931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311688447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 537021 + ... + 539457.

It is an arithmetic number, because the mean of its divisors is an integer number (60635498).

Almost surely, 2^1311688443 is an apocalyptic number.

1311688443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1311688443 is a deficient number, since it is larger than the sum of its proper divisors (628647493).

1311688443 is a wasteful number, since it uses less digits than its factorization.

1311688443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863.

The product of its digits is 55296, while the sum is 39.

The square root of 1311688443 is about 36217.2395828285. The cubic root of 1311688443 is about 1094.6540730845.

It can be divided in two parts, 1311688 and 443, that added together give a palindrome (1312131).

The spelling of 1311688443 in words is "one billion, three hundred eleven million, six hundred eighty-eight thousand, four hundred forty-three".