31322213231 has 8 divisors (see below), whose sum is σ = 31449316800. Its totient is φ = 31195221120.

The previous prime is 31322213213. The next prime is 31322213239. The reversal of 31322213231 is 13231222313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31322213231 is a prime.

It is a super-2 number, since 2×31322213231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31322213197 and 31322213206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31322213239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560330 + ... + 613688.

It is an arithmetic number, because the mean of its divisors is an integer number (3931164600).

Almost surely, 2^31322213231 is an apocalyptic number.

31322213231 is a deficient number, since it is larger than the sum of its proper divisors (127103569).

31322213231 is a wasteful number, since it uses less digits than its factorization.

31322213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55729.

The product of its digits is 1296, while the sum is 23.

Adding to 31322213231 its reverse (13231222313), we get a palindrome (44553435544).

The spelling of 31322213231 in words is "thirty-one billion, three hundred twenty-two million, two hundred thirteen thousand, two hundred thirty-one".