1131231311 has 16 divisors (see below), whose sum is σ = 1319105088. Its totient is φ = 949977600.

The previous prime is 1131231293. The next prime is 1131231317. The reversal of 1131231311 is 1131321311.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131231311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1131231311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131231317) 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, 325121 + ... + 328581.

It is an arithmetic number, because the mean of its divisors is an integer number (82444068).

Almost surely, 2^1131231311 is an apocalyptic number.

1131231311 is a deficient number, since it is larger than the sum of its proper divisors (187873777).

1131231311 is an equidigital number, since it uses as much as digits as its factorization.

1131231311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4402.

The product of its digits is 54, while the sum is 17.

The square root of 1131231311 is about 33633.7822880508. The cubic root of 1131231311 is about 1041.9586213480.

Adding to 1131231311 its reverse (1131321311), we get a palindrome (2262552622).

Subtracting 1131231311 from its reverse (1131321311), we obtain a square (90000 = 300²).

The spelling of 1131231311 in words is "one billion, one hundred thirty-one million, two hundred thirty-one thousand, three hundred eleven".