231011111211031 has 4 divisors (see below), whose sum is σ = 231011473852152. Its totient is φ = 231010748569912.

The previous prime is 231011111211029. The next prime is 231011111211071. The reversal of 231011111211031 is 130112111110132.

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

It is a cyclic number.

It is not a de Polignac number, because 231011111211031 - 2¹ = 231011111211029 is a prime.

It is a super-2 number, since 2×231011111211031² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231011111211071) 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, 180363340 + ... + 181639633.

It is an arithmetic number, because the mean of its divisors is an integer number (57752868463038).

Almost surely, 2^{231011111211031} is an apocalyptic number.

231011111211031 is a deficient number, since it is larger than the sum of its proper divisors (362641121).

231011111211031 is an equidigital number, since it uses as much as digits as its factorization.

231011111211031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362641120.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 231011111211031 its reverse (130112111110132), we get a palindrome (361123222321163).

The spelling of 231011111211031 in words is "two hundred thirty-one trillion, eleven billion, one hundred eleven million, two hundred eleven thousand, thirty-one".