3111331231 has 4 divisors (see below), whose sum is σ = 3111445912. Its totient is φ = 3111216552.

The previous prime is 3111331219. The next prime is 3111331241. The reversal of 3111331231 is 1321331113.

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 3111331231 - 2⁵ = 3111331199 is a prime.

It is a super-2 number, since 2×3111331231² = 19360764057991950722, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 3111331199 and 3111331208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3111331241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8740 + ... + 79366.

It is an arithmetic number, because the mean of its divisors is an integer number (777861478).

Almost surely, 2^3111331231 is an apocalyptic number.

3111331231 is a deficient number, since it is larger than the sum of its proper divisors (114681).

3111331231 is an equidigital number, since it uses as much as digits as its factorization.

3111331231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114680.

The product of its digits is 162, while the sum is 19.

The square root of 3111331231 is about 55779.3082692857. The cubic root of 3111331231 is about 1459.8741417435.

Adding to 3111331231 its reverse (1321331113), we get a palindrome (4432662344).

The spelling of 3111331231 in words is "three billion, one hundred eleven million, three hundred thirty-one thousand, two hundred thirty-one".