31871713 has 2 divisors, whose sum is σ = 31871714. Its totient is φ = 31871712.

The previous prime is 31871711. The next prime is 31871717. The reversal of 31871713 is 31717813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25070049 + 6801664 = 5007^2 + 2608^2 .

It is a cyclic number.

It is not a de Polignac number, because 31871713 - 2¹ = 31871711 is a prime.

Together with 31871711, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31871711) 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, 15935856 + 15935857.

It is an arithmetic number, because the mean of its divisors is an integer number (15935857).

Almost surely, 2^31871713 is an apocalyptic number.

It is an amenable number.

31871713 is a deficient number, since it is larger than the sum of its proper divisors (1).

31871713 is an equidigital number, since it uses as much as digits as its factorization.

31871713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 31.

The square root of 31871713 is about 5645.5037862001. The cubic root of 31871713 is about 317.0553861037.

It can be divided in two parts, 3187 and 1713, that added together give a square (4900 = 70²).

The spelling of 31871713 in words is "thirty-one million, eight hundred seventy-one thousand, seven hundred thirteen".