31310320113 has 12 divisors (see below), whose sum is σ = 45228090960. Its totient is φ = 20872589976.

The previous prime is 31310320103. The next prime is 31310320117. The reversal of 31310320113 is 31102301313.

It is a happy number.

31310320113 is a `hidden beast` number, since 31 + 310 + 320 + 1 + 1 + 3 = 666.

It is not a de Polignac number, because 31310320113 - 2²¹ = 31308222961 is a prime.

It is a super-2 number, since 2×31310320113² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31310320117) 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 11 ways as a sum of consecutive naturals, for example, 168058 + ... + 301436.

It is an arithmetic number, because the mean of its divisors is an integer number (3769007580).

Almost surely, 2^31310320113 is an apocalyptic number.

It is an amenable number.

31310320113 is a deficient number, since it is larger than the sum of its proper divisors (13917770847).

31310320113 is a wasteful number, since it uses less digits than its factorization.

31310320113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159468 (or 159465 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31310320113 its reverse (31102301313), we get a palindrome (62412621426).

The spelling of 31310320113 in words is "thirty-one billion, three hundred ten million, three hundred twenty thousand, one hundred thirteen".