31313112231 has 32 divisors (see below), whose sum is σ = 42543103680. Its totient is φ = 20483767296.

The previous prime is 31313112217. The next prime is 31313112251. The reversal of 31313112231 is 13221131313.

It is a happy number.

It is not a de Polignac number, because 31313112231 - 2⁶ = 31313112167 is a prime.

It is a super-2 number, since 2×31313112231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31313112198 and 31313112207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313112251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35704365 + ... + 35705241.

It is an arithmetic number, because the mean of its divisors is an integer number (1329471990).

Almost surely, 2^31313112231 is an apocalyptic number.

31313112231 is a deficient number, since it is larger than the sum of its proper divisors (11229991449).

31313112231 is a wasteful number, since it uses less digits than its factorization.

31313112231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923.

The product of its digits is 324, while the sum is 21.

Adding to 31313112231 its reverse (13221131313), we get a palindrome (44534243544).

The spelling of 31313112231 in words is "thirty-one billion, three hundred thirteen million, one hundred twelve thousand, two hundred thirty-one".