2231213231 has 4 divisors (see below), whose sum is σ = 2402845032. Its totient is φ = 2059581432.

The previous prime is 2231213213. The next prime is 2231213249. The reversal of 2231213231 is 1323121322.

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 (2231213213) and next prime (2231213249).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2231213231 is a prime.

It is a super-3 number, since 3×2231213231³ (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 (2231213261) 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, 85815881 + ... + 85815906.

It is an arithmetic number, because the mean of its divisors is an integer number (600711258).

Almost surely, 2^2231213231 is an apocalyptic number.

2231213231 is a deficient number, since it is larger than the sum of its proper divisors (171631801).

2231213231 is a wasteful number, since it uses less digits than its factorization.

2231213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171631800.

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

The square root of 2231213231 is about 47235.7198632560. The cubic root of 2231213231 is about 1306.7134426441.

Adding to 2231213231 its reverse (1323121322), we get a palindrome (3554334553).

The spelling of 2231213231 in words is "two billion, two hundred thirty-one million, two hundred thirteen thousand, two hundred thirty-one".