31975117 has 2 divisors, whose sum is σ = 31975118. Its totient is φ = 31975116.

The previous prime is 31975061. The next prime is 31975123. The reversal of 31975117 is 71157913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31573161 + 401956 = 5619^2 + 634^2 .

It is an emirp because it is prime and its reverse (71157913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31975117 - 2¹⁹ = 31450829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31975717) 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 as a sum of consecutive naturals, namely, 15987558 + 15987559.

It is an arithmetic number, because the mean of its divisors is an integer number (15987559).

Almost surely, 2^31975117 is an apocalyptic number.

It is an amenable number.

31975117 is a deficient number, since it is larger than the sum of its proper divisors (1).

31975117 is an equidigital number, since it uses as much as digits as its factorization.

31975117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6615, while the sum is 34.

The square root of 31975117 is about 5654.6544545180. The cubic root of 31975117 is about 317.3978988459.

The spelling of 31975117 in words is "thirty-one million, nine hundred seventy-five thousand, one hundred seventeen".