197320997 has 2 divisors, whose sum is σ = 197320998. Its totient is φ = 197320996.

The previous prime is 197320931. The next prime is 197321009. The reversal of 197320997 is 799023791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178649956 + 18671041 = 13366^2 + 4321^2 .

It is a cyclic number.

It is not a de Polignac number, because 197320997 - 2¹² = 197316901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197320397) 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, 98660498 + 98660499.

It is an arithmetic number, because the mean of its divisors is an integer number (98660499).

Almost surely, 2^197320997 is an apocalyptic number.

It is an amenable number.

197320997 is a deficient number, since it is larger than the sum of its proper divisors (1).

197320997 is an equidigital number, since it uses as much as digits as its factorization.

197320997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 214326, while the sum is 47.

The square root of 197320997 is about 14047.0992379210. The cubic root of 197320997 is about 582.1806505336.

The spelling of 197320997 in words is "one hundred ninety-seven million, three hundred twenty thousand, nine hundred ninety-seven".