231123511011 has 4 divisors (see below), whose sum is σ = 308164681352. Its totient is φ = 154082340672.

The previous prime is 231123511001. The next prime is 231123511013. The reversal of 231123511011 is 110115321132.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 231123511011 - 2⁷ = 231123510883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231123511013) 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, 38520585166 + ... + 38520585171.

It is an arithmetic number, because the mean of its divisors is an integer number (77041170338).

Almost surely, 2^231123511011 is an apocalyptic number.

231123511011 is a deficient number, since it is larger than the sum of its proper divisors (77041170341).

231123511011 is an equidigital number, since it uses as much as digits as its factorization.

231123511011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77041170340.

The product of its (nonzero) digits is 180, while the sum is 21.

Adding to 231123511011 its reverse (110115321132), we get a palindrome (341238832143).

The spelling of 231123511011 in words is "two hundred thirty-one billion, one hundred twenty-three million, five hundred eleven thousand, eleven".