197201681 has 2 divisors, whose sum is σ = 197201682. Its totient is φ = 197201680.

The previous prime is 197201657. The next prime is 197201713. The reversal of 197201681 is 186102791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196420225 + 781456 = 14015^2 + 884^2 .

It is a cyclic number.

It is not a de Polignac number, because 197201681 - 2¹⁰ = 197200657 is a prime.

It is a super-2 number, since 2×197201681² = 77777005978451522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (197201651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98600840 + 98600841.

It is an arithmetic number, because the mean of its divisors is an integer number (98600841).

Almost surely, 2^197201681 is an apocalyptic number.

It is an amenable number.

197201681 is a deficient number, since it is larger than the sum of its proper divisors (1).

197201681 is an equidigital number, since it uses as much as digits as its factorization.

197201681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 197201681 is about 14042.8515978771. The cubic root of 197201681 is about 582.0632826013.

The spelling of 197201681 in words is "one hundred ninety-seven million, two hundred one thousand, six hundred eighty-one".