1311132231 has 32 divisors (see below), whose sum is σ = 1981986240. Its totient is φ = 856396800.

The previous prime is 1311132211. The next prime is 1311132239. The reversal of 1311132231 is 1322311131.

1311132231 is a `hidden beast` number, since 1 + 311 + 1 + 322 + 31 = 666.

It is not a de Polignac number, because 1311132231 - 2⁷ = 1311132103 is a prime.

It is a super-2 number, since 2×1311132231² = 3438135454334074722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311132239) 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, 461391 + ... + 464223.

It is an arithmetic number, because the mean of its divisors is an integer number (61937070).

Almost surely, 2^1311132231 is an apocalyptic number.

1311132231 is a deficient number, since it is larger than the sum of its proper divisors (670854009).

1311132231 is a wasteful number, since it uses less digits than its factorization.

1311132231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3184 (or 3178 counting only the distinct ones).

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

The square root of 1311132231 is about 36209.5599393309. The cubic root of 1311132231 is about 1094.4993244942.

Adding to 1311132231 its reverse (1322311131), we get a palindrome (2633443362).

The spelling of 1311132231 in words is "one billion, three hundred eleven million, one hundred thirty-two thousand, two hundred thirty-one".