997802171 has 2 divisors, whose sum is σ = 997802172. Its totient is φ = 997802170.

The previous prime is 997802167. The next prime is 997802203. The reversal of 997802171 is 171208799.

It is a weak prime.

It is an emirp because it is prime and its reverse (171208799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997802171 - 2² = 997802167 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997802161) 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, 498901085 + 498901086.

It is an arithmetic number, because the mean of its divisors is an integer number (498901086).

Almost surely, 2^997802171 is an apocalyptic number.

997802171 is a deficient number, since it is larger than the sum of its proper divisors (1).

997802171 is an equidigital number, since it uses as much as digits as its factorization.

997802171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 44.

The square root of 997802171 is about 31588.0067588951. The cubic root of 997802171 is about 999.2668529601.

The spelling of 997802171 in words is "nine hundred ninety-seven million, eight hundred two thousand, one hundred seventy-one".