1311232231 has 4 divisors (see below), whose sum is σ = 1368242352. Its totient is φ = 1254222112.

The previous prime is 1311232229. The next prime is 1311232297. The reversal of 1311232231 is 1322321131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1311232231 - 2¹ = 1311232229 is a prime.

It is a super-2 number, since 2×1311232231² = 3438659927226474722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311232199 and 1311232208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311238231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28505026 + ... + 28505071.

It is an arithmetic number, because the mean of its divisors is an integer number (342060588).

Almost surely, 2^1311232231 is an apocalyptic number.

1311232231 is a deficient number, since it is larger than the sum of its proper divisors (57010121).

1311232231 is an equidigital number, since it uses as much as digits as its factorization.

1311232231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57010120.

The product of its digits is 216, while the sum is 19.

The square root of 1311232231 is about 36210.9407638078. The cubic root of 1311232231 is about 1094.5271495926.

Adding to 1311232231 its reverse (1322321131), we get a palindrome (2633553362).

Subtracting 1311232231 from its reverse (1322321131), we obtain a square (11088900 = 3330²).

The spelling of 1311232231 in words is "one billion, three hundred eleven million, two hundred thirty-two thousand, two hundred thirty-one".