31320321232231 has 16 divisors (see below), whose sum is σ = 31877070559488. Its totient is φ = 30766860331200.

The previous prime is 31320321232171. The next prime is 31320321232261. The reversal of 31320321232231 is 13223212302313.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31320321232231 - 2²³ = 31320312843623 is a prime.

It is a super-2 number, since 2×31320321232231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31320321232231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320321232261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57118636 + ... + 57664366.

It is an arithmetic number, because the mean of its divisors is an integer number (1992316909968).

Almost surely, 2^{31320321232231} is an apocalyptic number.

31320321232231 is a deficient number, since it is larger than the sum of its proper divisors (556749327257).

31320321232231 is a wasteful number, since it uses less digits than its factorization.

31320321232231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548742.

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 31320321232231 its reverse (13223212302313), we get a palindrome (44543533534544).

The spelling of 31320321232231 in words is "thirty-one trillion, three hundred twenty billion, three hundred twenty-one million, two hundred thirty-two thousand, two hundred thirty-one".