31132313 has 4 divisors (see below), whose sum is σ = 31202100. Its totient is φ = 31062528.

The previous prime is 31132303. The next prime is 31132327. The reversal of 31132313 is 31323113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31323113 = 31 ⋅1010423.

It can be written as a sum of positive squares in 2 ways, for example, as 17530969 + 13601344 = 4187^2 + 3688^2 .

It is a cyclic number.

It is not a de Polignac number, because 31132313 - 2⁶ = 31132249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31132291 and 31132300.

It is not an unprimeable number, because it can be changed into a prime (31132303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34220 + ... + 35117.

It is an arithmetic number, because the mean of its divisors is an integer number (7800525).

Almost surely, 2^31132313 is an apocalyptic number.

It is an amenable number.

31132313 is a deficient number, since it is larger than the sum of its proper divisors (69787).

31132313 is an equidigital number, since it uses as much as digits as its factorization.

31132313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69786.

The product of its digits is 162, while the sum is 17.

The square root of 31132313 is about 5579.6337693436. The cubic root of 31132313 is about 314.5843615285.

Adding to 31132313 its reverse (31323113), we get a palindrome (62455426).

The spelling of 31132313 in words is "thirty-one million, one hundred thirty-two thousand, three hundred thirteen".