31317113 has 4 divisors (see below), whose sum is σ = 31385508. Its totient is φ = 31248720.

The previous prime is 31317109. The next prime is 31317119. The reversal of 31317113 is 31171313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31171313 = 173 ⋅180181.

It can be written as a sum of positive squares in 2 ways, for example, as 20539024 + 10778089 = 4532^2 + 3283^2 .

It is a cyclic number.

It is not a de Polignac number, because 31317113 - 2² = 31317109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31317119) 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, 33506 + ... + 34427.

It is an arithmetic number, because the mean of its divisors is an integer number (7846377).

Almost surely, 2^31317113 is an apocalyptic number.

It is an amenable number.

31317113 is a deficient number, since it is larger than the sum of its proper divisors (68395).

31317113 is an equidigital number, since it uses as much as digits as its factorization.

31317113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68394.

The product of its digits is 189, while the sum is 20.

The square root of 31317113 is about 5596.1694935018. The cubic root of 31317113 is about 315.2055867977.

Adding to 31317113 its reverse (31171313), we get a palindrome (62488426).

The spelling of 31317113 in words is "thirty-one million, three hundred seventeen thousand, one hundred thirteen".