1311223243 has 32 divisors (see below), whose sum is σ = 1562042880. Its totient is φ = 1087296000.

The previous prime is 1311223241. The next prime is 1311223259. The reversal of 1311223243 is 3423221131.

It is a cyclic number.

It is not a de Polignac number, because 1311223243 - 2¹ = 1311223241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311223241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 809088 + ... + 810706.

It is an arithmetic number, because the mean of its divisors is an integer number (48813840).

Almost surely, 2^1311223243 is an apocalyptic number.

1311223243 is a deficient number, since it is larger than the sum of its proper divisors (250819637).

1311223243 is a wasteful number, since it uses less digits than its factorization.

1311223243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779.

The product of its digits is 864, while the sum is 22.

The square root of 1311223243 is about 36210.8166574575. The cubic root of 1311223243 is about 1094.5246487306.

Adding to 1311223243 its reverse (3423221131), we get a palindrome (4734444374).

The spelling of 1311223243 in words is "one billion, three hundred eleven million, two hundred twenty-three thousand, two hundred forty-three".