1311123231 has 48 divisors (see below), whose sum is σ = 2135147040. Its totient is φ = 768303360.

The previous prime is 1311123227. The next prime is 1311123271. The reversal of 1311123231 is 1323211131.

1311123231 is a `hidden beast` number, since 1 + 311 + 123 + 231 = 666.

1311123231 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1311123231 - 2² = 1311123227 is a prime.

It is a super-2 number, since 2×1311123231² = 3438088253735758722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311123221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 632665 + ... + 634733.

It is an arithmetic number, because the mean of its divisors is an integer number (44482230).

Almost surely, 2^1311123231 is an apocalyptic number.

1311123231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1311123231 is a deficient number, since it is larger than the sum of its proper divisors (824023809).

1311123231 is a wasteful number, since it uses less digits than its factorization.

1311123231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296 (or 2293 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1311123231 is about 36209.4356625452. The cubic root of 1311123231 is about 1094.4968201659.

Adding to 1311123231 its reverse (1323211131), we get a palindrome (2634334362).

The spelling of 1311123231 in words is "one billion, three hundred eleven million, one hundred twenty-three thousand, two hundred thirty-one".