31130171 has 2 divisors, whose sum is σ = 31130172. Its totient is φ = 31130170.

The previous prime is 31130161. The next prime is 31130221. The reversal of 31130171 is 17103113.

It is a weak prime.

It is an emirp because it is prime and its reverse (17103113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31130171 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31130101) 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 as a sum of consecutive naturals, namely, 15565085 + 15565086.

It is an arithmetic number, because the mean of its divisors is an integer number (15565086).

Almost surely, 2^31130171 is an apocalyptic number.

31130171 is a deficient number, since it is larger than the sum of its proper divisors (1).

31130171 is an equidigital number, since it uses as much as digits as its factorization.

31130171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63, while the sum is 17.

The square root of 31130171 is about 5579.4418179599. The cubic root of 31130171 is about 314.5771465688.

Adding to 31130171 its reverse (17103113), we get a palindrome (48233284).

The spelling of 31130171 in words is "thirty-one million, one hundred thirty thousand, one hundred seventy-one".