31313323231 has 16 divisors (see below), whose sum is σ = 33130976256. Its totient is φ = 29547000000.

The previous prime is 31313323229. The next prime is 31313323289. The reversal of 31313323231 is 13232331313.

It is a cyclic number.

It is not a de Polignac number, because 31313323231 - 2¹ = 31313323229 is a prime.

It is a super-2 number, since 2×31313323231² (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 = 31313323196 and 31313323205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313323031) 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, 2549856 + ... + 2562106.

It is an arithmetic number, because the mean of its divisors is an integer number (2070686016).

Almost surely, 2^31313323231 is an apocalyptic number.

31313323231 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31313323231 is a deficient number, since it is larger than the sum of its proper divisors (1817653025).

31313323231 is a wasteful number, since it uses less digits than its factorization.

31313323231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14334.

The product of its digits is 2916, while the sum is 25.

Adding to 31313323231 its reverse (13232331313), we get a palindrome (44545654544).

The spelling of 31313323231 in words is "thirty-one billion, three hundred thirteen million, three hundred twenty-three thousand, two hundred thirty-one".