1323111131 has 2 divisors, whose sum is σ = 1323111132. Its totient is φ = 1323111130.

The previous prime is 1323111103. The next prime is 1323111187. The reversal of 1323111131 is 1311113231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1323111131 - 2²² = 1318916827 is a prime.

It is a super-2 number, since 2×1323111131² = 3501246129952198322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1323111191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661555565 + 661555566.

It is an arithmetic number, because the mean of its divisors is an integer number (661555566).

Almost surely, 2^1323111131 is an apocalyptic number.

1323111131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323111131 is an equidigital number, since it uses as much as digits as its factorization.

1323111131 is an evil number, because the sum of its binary digits is even.

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

The square root of 1323111131 is about 36374.5945819331. The cubic root of 1323111131 is about 1097.8224500377.

Adding to 1323111131 its reverse (1311113231), we get a palindrome (2634224362).

The spelling of 1323111131 in words is "one billion, three hundred twenty-three million, one hundred eleven thousand, one hundred thirty-one".