1231232311 has 2 divisors, whose sum is σ = 1231232312. Its totient is φ = 1231232310.

The previous prime is 1231232309. The next prime is 1231232333. The reversal of 1231232311 is 1132321321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231232311 - 2¹ = 1231232309 is a prime.

Together with 1231232309, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231232341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615616155 + 615616156.

It is an arithmetic number, because the mean of its divisors is an integer number (615616156).

Almost surely, 2^1231232311 is an apocalyptic number.

1231232311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231232311 is an equidigital number, since it uses as much as digits as its factorization.

1231232311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 1231232311 is about 35088.9200603267. The cubic root of 1231232311 is about 1071.7989683804.

Adding to 1231232311 its reverse (1132321321), we get a palindrome (2363553632).

The spelling of 1231232311 in words is "one billion, two hundred thirty-one million, two hundred thirty-two thousand, three hundred eleven".