31313111131 has 2 divisors, whose sum is σ = 31313111132. Its totient is φ = 31313111130.

The previous prime is 31313111111. The next prime is 31313111231. The reversal of 31313111131 is 13111131313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31313111131 - 2⁷ = 31313111003 is a prime.

It is a super-2 number, since 2×31313111131² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31313111099 and 31313111108.

It is not a weakly prime, because it can be changed into another prime (31313111111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656555565 + 15656555566.

It is an arithmetic number, because the mean of its divisors is an integer number (15656555566).

Almost surely, 2^31313111131 is an apocalyptic number.

31313111131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31313111131 is an equidigital number, since it uses as much as digits as its factorization.

31313111131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81, while the sum is 19.

Adding to 31313111131 its reverse (13111131313), we get a palindrome (44424242444).

The spelling of 31313111131 in words is "thirty-one billion, three hundred thirteen million, one hundred eleven thousand, one hundred thirty-one".