31313113131 has 4 divisors (see below), whose sum is σ = 41750817512. Its totient is φ = 20875408752.

The previous prime is 31313112979. The next prime is 31313113141. The reversal of 31313113131 is 13131131313.

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

It is not a de Polignac number, because 31313113131 - 2¹⁵ = 31313080363 is a prime.

It is a super-2 number, since 2×31313113131² (a number of 22 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31313113098 and 31313113107.

It is not an unprimeable number, because it can be changed into a prime (31313113141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5218852186 + ... + 5218852191.

It is an arithmetic number, because the mean of its divisors is an integer number (10437704378).

Almost surely, 2^31313113131 is an apocalyptic number.

31313113131 is a deficient number, since it is larger than the sum of its proper divisors (10437704381).

31313113131 is a wasteful number, since it uses less digits than its factorization.

31313113131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10437704380.

The product of its digits is 243, while the sum is 21.

Adding to 31313113131 its reverse (13131131313), we get a palindrome (44444244444).

It can be divided in two parts, 3 and 1313113131, that multiplied together give a palindrome (3939339393).

The spelling of 31313113131 in words is "thirty-one billion, three hundred thirteen million, one hundred thirteen thousand, one hundred thirty-one".