197958797 has 2 divisors, whose sum is σ = 197958798. Its totient is φ = 197958796.

The previous prime is 197958781. The next prime is 197958809. The reversal of 197958797 is 797859791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192487876 + 5470921 = 13874^2 + 2339^2 .

It is an emirp because it is prime and its reverse (797859791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197958797 - 2⁴ = 197958781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197958707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98979398 + 98979399.

It is an arithmetic number, because the mean of its divisors is an integer number (98979399).

Almost surely, 2^197958797 is an apocalyptic number.

It is an amenable number.

197958797 is a deficient number, since it is larger than the sum of its proper divisors (1).

197958797 is an equidigital number, since it uses as much as digits as its factorization.

197958797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10001880, while the sum is 62.

The square root of 197958797 is about 14069.7831184422. The cubic root of 197958797 is about 582.8072361055.

The spelling of 197958797 in words is "one hundred ninety-seven million, nine hundred fifty-eight thousand, seven hundred ninety-seven".