1123131311 has 2 divisors, whose sum is σ = 1123131312. Its totient is φ = 1123131310.

The previous prime is 1123131293. The next prime is 1123131341. The reversal of 1123131311 is 1131313211.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123131311 is a prime.

It is a super-2 number, since 2×1123131311² = 2522847883497157442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1123131311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123131341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561565655 + 561565656.

It is an arithmetic number, because the mean of its divisors is an integer number (561565656).

Almost surely, 2^1123131311 is an apocalyptic number.

1123131311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123131311 is an equidigital number, since it uses as much as digits as its factorization.

1123131311 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1123131311 is about 33513.1513140737. The cubic root of 1123131311 is about 1039.4657361274.

Adding to 1123131311 its reverse (1131313211), we get a palindrome (2254444522).

The spelling of 1123131311 in words is "one billion, one hundred twenty-three million, one hundred thirty-one thousand, three hundred eleven".