31323311131 has 4 divisors (see below), whose sum is σ = 35798069872. Its totient is φ = 26848552392.

The previous prime is 31323311113. The next prime is 31323311141. The reversal of 31323311131 is 13111332313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13111332313 = 41 ⋅319788593.

It is a cyclic number.

It is not a de Polignac number, because 31323311131 - 2¹³ = 31323302939 is a prime.

It is a super-2 number, since 2×31323311131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31323311141) 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 3 ways as a sum of consecutive naturals, for example, 2237379360 + ... + 2237379373.

It is an arithmetic number, because the mean of its divisors is an integer number (8949517468).

Almost surely, 2^31323311131 is an apocalyptic number.

31323311131 is a deficient number, since it is larger than the sum of its proper divisors (4474758741).

31323311131 is an equidigital number, since it uses as much as digits as its factorization.

31323311131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4474758740.

The product of its digits is 486, while the sum is 22.

Adding to 31323311131 its reverse (13111332313), we get a palindrome (44434643444).

The spelling of 31323311131 in words is "thirty-one billion, three hundred twenty-three million, three hundred eleven thousand, one hundred thirty-one".