1311223043 has 8 divisors (see below), whose sum is σ = 1416602208. Its totient is φ = 1206489024.

The previous prime is 1311223033. The next prime is 1311223049. The reversal of 1311223043 is 3403221131.

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

It is not a de Polignac number, because 1311223043 - 2¹² = 1311218947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311223049) 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, 157055 + ... + 165192.

It is an arithmetic number, because the mean of its divisors is an integer number (177075276).

Almost surely, 2^1311223043 is an apocalyptic number.

1311223043 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1311223043 is a deficient number, since it is larger than the sum of its proper divisors (105379165).

1311223043 is a wasteful number, since it uses less digits than its factorization.

1311223043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322573.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1311223043 is about 36210.8138958516. The cubic root of 1311223043 is about 1094.5245930816.

Adding to 1311223043 its reverse (3403221131), we get a palindrome (4714444174).

The spelling of 1311223043 in words is "one billion, three hundred eleven million, two hundred twenty-three thousand, forty-three".