2231320331 has 4 divisors (see below), whose sum is σ = 2234268672. Its totient is φ = 2228371992.

The previous prime is 2231320283. The next prime is 2231320339. The reversal of 2231320331 is 1330231322.

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 2231320331 - 2¹⁴ = 2231303947 is a prime.

It is a super-3 number, since 3×2231320331³ (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 not an unprimeable number, because it can be changed into a prime (2231320339) 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, 1473035 + ... + 1474548.

It is an arithmetic number, because the mean of its divisors is an integer number (558567168).

Almost surely, 2^2231320331 is an apocalyptic number.

2231320331 is a deficient number, since it is larger than the sum of its proper divisors (2948341).

2231320331 is an equidigital number, since it uses as much as digits as its factorization.

2231320331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2948340.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 2231320331 is about 47236.8535256107. The cubic root of 2231320331 is about 1306.7343500692.

Adding to 2231320331 its reverse (1330231322), we get a palindrome (3561551653).

The spelling of 2231320331 in words is "two billion, two hundred thirty-one million, three hundred twenty thousand, three hundred thirty-one".