1231350311 has 2 divisors, whose sum is σ = 1231350312. Its totient is φ = 1231350310.

The previous prime is 1231350283. The next prime is 1231350313. The reversal of 1231350311 is 1130531321.

It is a strong prime.

It is an emirp because it is prime and its reverse (1130531321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231350311 - 2³⁰ = 157608487 is a prime.

Together with 1231350313, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231350313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615675155 + 615675156.

It is an arithmetic number, because the mean of its divisors is an integer number (615675156).

Almost surely, 2^1231350311 is an apocalyptic number.

1231350311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231350311 is an equidigital number, since it uses as much as digits as its factorization.

1231350311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 1231350311 is about 35090.6014624999. The cubic root of 1231350311 is about 1071.8332073124.

Adding to 1231350311 its reverse (1130531321), we get a palindrome (2361881632).

The spelling of 1231350311 in words is "one billion, two hundred thirty-one million, three hundred fifty thousand, three hundred eleven".