997228171 has 2 divisors, whose sum is σ = 997228172. Its totient is φ = 997228170.

The previous prime is 997228163. The next prime is 997228213. The reversal of 997228171 is 171822799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997228171 - 2³ = 997228163 is a prime.

It is not a weakly prime, because it can be changed into another prime (997225171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498614085 + 498614086.

It is an arithmetic number, because the mean of its divisors is an integer number (498614086).

Almost surely, 2^997228171 is an apocalyptic number.

997228171 is a deficient number, since it is larger than the sum of its proper divisors (1).

997228171 is an equidigital number, since it uses as much as digits as its factorization.

997228171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 46.

The square root of 997228171 is about 31578.9197250318. The cubic root of 997228171 is about 999.0752020123.

The spelling of 997228171 in words is "nine hundred ninety-seven million, two hundred twenty-eight thousand, one hundred seventy-one".