197145997 has 2 divisors, whose sum is σ = 197145998. Its totient is φ = 197145996.

The previous prime is 197145979. The next prime is 197146021. The reversal of 197145997 is 799541791.

Together with previous prime (197145979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192959881 + 4186116 = 13891^2 + 2046^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197145997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197145937) 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, 98572998 + 98572999.

It is an arithmetic number, because the mean of its divisors is an integer number (98572999).

Almost surely, 2^197145997 is an apocalyptic number.

It is an amenable number.

197145997 is a deficient number, since it is larger than the sum of its proper divisors (1).

197145997 is an equidigital number, since it uses as much as digits as its factorization.

197145997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 52.

The square root of 197145997 is about 14040.8688121498. The cubic root of 197145997 is about 582.0084915488.

The spelling of 197145997 in words is "one hundred ninety-seven million, one hundred forty-five thousand, nine hundred ninety-seven".