231231323311 has 4 divisors (see below), whose sum is σ = 231232311232. Its totient is φ = 231230335392.

The previous prime is 231231323273. The next prime is 231231323341. The reversal of 231231323311 is 113323132132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 231231323311 - 2²¹ = 231229226159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231231323341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77506 + ... + 684448.

It is an arithmetic number, because the mean of its divisors is an integer number (57808077808).

Almost surely, 2^231231323311 is an apocalyptic number.

231231323311 is a deficient number, since it is larger than the sum of its proper divisors (987921).

231231323311 is an equidigital number, since it uses as much as digits as its factorization.

231231323311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987920.

The product of its digits is 1944, while the sum is 25.

Adding to 231231323311 its reverse (113323132132), we get a palindrome (344554455443).

The spelling of 231231323311 in words is "two hundred thirty-one billion, two hundred thirty-one million, three hundred twenty-three thousand, three hundred eleven".