1311431043 has 64 divisors (see below), whose sum is σ = 2034385920. Its totient is φ = 749548800.

The previous prime is 1311431041. The next prime is 1311431081. The reversal of 1311431043 is 3401341131.

It is not a de Polignac number, because 1311431043 - 2¹ = 1311431041 is a prime.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1311431041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6215208 + ... + 6215418.

It is an arithmetic number, because the mean of its divisors is an integer number (31787280).

Almost surely, 2^1311431043 is an apocalyptic number.

1311431043 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1311431043 is a deficient number, since it is larger than the sum of its proper divisors (722954877).

1311431043 is a wasteful number, since it uses less digits than its factorization.

1311431043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1311431043 is about 36213.6858521747. The cubic root of 1311431043 is about 1094.5824650253.

Adding to 1311431043 its reverse (3401341131), we get a palindrome (4712772174).

The spelling of 1311431043 in words is "one billion, three hundred eleven million, four hundred thirty-one thousand, forty-three".