197638427201 has 2 divisors, whose sum is σ = 197638427202. Its totient is φ = 197638427200.

The previous prime is 197638427141. The next prime is 197638427221. The reversal of 197638427201 is 102724836791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101089023025 + 96549404176 = 317945^2 + 310724^2 .

It is a cyclic number.

It is not a de Polignac number, because 197638427201 - 2⁶ = 197638427137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197638427201.

It is not a weakly prime, because it can be changed into another prime (197638427221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98819213600 + 98819213601.

It is an arithmetic number, because the mean of its divisors is an integer number (98819213601).

Almost surely, 2^197638427201 is an apocalyptic number.

It is an amenable number.

197638427201 is a deficient number, since it is larger than the sum of its proper divisors (1).

197638427201 is an equidigital number, since it uses as much as digits as its factorization.

197638427201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 197638427201 in words is "one hundred ninety-seven billion, six hundred thirty-eight million, four hundred twenty-seven thousand, two hundred one".