1231132311 has 16 divisors (see below), whose sum is σ = 1824703200. Its totient is φ = 820393344.

The previous prime is 1231132307. The next prime is 1231132319. The reversal of 1231132311 is 1132311321.

1231132311 is a `hidden beast` number, since 12 + 311 + 32 + 311 = 666.

It is not a de Polignac number, because 1231132311 - 2² = 1231132307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231132319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61705 + ... + 79181.

It is an arithmetic number, because the mean of its divisors is an integer number (114043950).

Almost surely, 2^1231132311 is an apocalyptic number.

1231132311 is a deficient number, since it is larger than the sum of its proper divisors (593570889).

1231132311 is a wasteful number, since it uses less digits than its factorization.

1231132311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20095 (or 20089 counting only the distinct ones).

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

The square root of 1231132311 is about 35087.4950801564. The cubic root of 1231132311 is about 1071.7699506237.

Adding to 1231132311 its reverse (1132311321), we get a palindrome (2363443632).

The spelling of 1231132311 in words is "one billion, two hundred thirty-one million, one hundred thirty-two thousand, three hundred eleven".