2231312231 has 4 divisors (see below), whose sum is σ = 2231408712. Its totient is φ = 2231215752.

The previous prime is 2231312227. The next prime is 2231312249. The reversal of 2231312231 is 1322131322.

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 2231312231 - 2² = 2231312227 is a prime.

It is a super-3 number, since 3×2231312231³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231312201) 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, 9440 + ... + 67466.

It is an arithmetic number, because the mean of its divisors is an integer number (557852178).

Almost surely, 2^2231312231 is an apocalyptic number.

2231312231 is a deficient number, since it is larger than the sum of its proper divisors (96481).

2231312231 is an equidigital number, since it uses as much as digits as its factorization.

2231312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96480.

The product of its digits is 432, while the sum is 20.

The square root of 2231312231 is about 47236.7677873921. The cubic root of 2231312231 is about 1306.7327688588.

Adding to 2231312231 its reverse (1322131322), we get a palindrome (3553443553).

The spelling of 2231312231 in words is "two billion, two hundred thirty-one million, three hundred twelve thousand, two hundred thirty-one".