31313133131 has 4 divisors (see below), whose sum is σ = 35786437872. Its totient is φ = 26839828392.

The previous prime is 31313133083. The next prime is 31313133151. The reversal of 31313133131 is 13133131313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31313133131 - 2¹⁰ = 31313132107 is a prime.

It is a super-2 number, since 2×31313133131² (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 = 31313133097 and 31313133106.

It is not an unprimeable number, because it can be changed into a prime (31313133151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2236652360 + ... + 2236652373.

It is an arithmetic number, because the mean of its divisors is an integer number (8946609468).

Almost surely, 2^31313133131 is an apocalyptic number.

31313133131 is a deficient number, since it is larger than the sum of its proper divisors (4473304741).

31313133131 is an equidigital number, since it uses as much as digits as its factorization.

31313133131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4473304740.

The product of its digits is 729, while the sum is 23.

Adding to 31313133131 its reverse (13133131313), we get a palindrome (44446264444).

The spelling of 31313133131 in words is "thirty-one billion, three hundred thirteen million, one hundred thirty-three thousand, one hundred thirty-one".