2311122031231 has 4 divisors (see below), whose sum is σ = 2488900649032. Its totient is φ = 2133343413432.

The previous prime is 2311122031201. The next prime is 2311122031261. The reversal of 2311122031231 is 1321302211132.

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

It is an interprime number because it is at equal distance from previous prime (2311122031201) and next prime (2311122031261).

It is a cyclic number.

It is not a de Polignac number, because 2311122031231 - 2⁵ = 2311122031199 is a prime.

It is a super-2 number, since 2×2311122031231² (a number of 26 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 (2311122031201) 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, 88889308881 + ... + 88889308906.

It is an arithmetic number, because the mean of its divisors is an integer number (622225162258).

Almost surely, 2^{2311122031231} is an apocalyptic number.

2311122031231 is a deficient number, since it is larger than the sum of its proper divisors (177778617801).

2311122031231 is a wasteful number, since it uses less digits than its factorization.

2311122031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177778617800.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 2311122031231 its reverse (1321302211132), we get a palindrome (3632424242363).

The spelling of 2311122031231 in words is "two trillion, three hundred eleven billion, one hundred twenty-two million, thirty-one thousand, two hundred thirty-one".