31110109 has 4 divisors (see below), whose sum is σ = 31164604. Its totient is φ = 31055616.

The previous prime is 31110091. The next prime is 31110133. The reversal of 31110109 is 90101113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90101113 = 53 ⋅1700021.

It can be written as a sum of positive squares in 2 ways, for example, as 18705625 + 12404484 = 4325^2 + 3522^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31110109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31110092 and 31110101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31110509) 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, 26382 + ... + 27535.

It is an arithmetic number, because the mean of its divisors is an integer number (7791151).

Almost surely, 2^31110109 is an apocalyptic number.

It is an amenable number.

31110109 is a deficient number, since it is larger than the sum of its proper divisors (54495).

31110109 is an equidigital number, since it uses as much as digits as its factorization.

31110109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54494.

The product of its (nonzero) digits is 27, while the sum is 16.

The square root of 31110109 is about 5577.6436781135. The cubic root of 31110109 is about 314.5095550894.

The spelling of 31110109 in words is "thirty-one million, one hundred ten thousand, one hundred nine".