197849728171 has 2 divisors, whose sum is σ = 197849728172. Its totient is φ = 197849728170.

The previous prime is 197849728169. The next prime is 197849728199. The reversal of 197849728171 is 171827948791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197849728171 - 2¹ = 197849728169 is a prime.

Together with 197849728169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (197849722171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98924864085 + 98924864086.

It is an arithmetic number, because the mean of its divisors is an integer number (98924864086).

Almost surely, 2^197849728171 is an apocalyptic number.

197849728171 is a deficient number, since it is larger than the sum of its proper divisors (1).

197849728171 is an equidigital number, since it uses as much as digits as its factorization.

197849728171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14224896, while the sum is 64.

The spelling of 197849728171 in words is "one hundred ninety-seven billion, eight hundred forty-nine million, seven hundred twenty-eight thousand, one hundred seventy-one".