195997 has 2 divisors, whose sum is σ = 195998. Its totient is φ = 195996.

The previous prime is 195991. The next prime is 196003. The reversal of 195997 is 799591.

It is a balanced prime because it is at equal distance from previous prime (195991) and next prime (196003).

It can be written as a sum of positive squares in only one way, i.e., 109561 + 86436 = 331^2 + 294^2 .

It is a cyclic number.

It is not a de Polignac number, because 195997 - 2⁷ = 195869 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195991) 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, 97998 + 97999.

It is an arithmetic number, because the mean of its divisors is an integer number (97999).

2¹⁹⁵⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

195997 is a deficient number, since it is larger than the sum of its proper divisors (1).

195997 is an equidigital number, since it uses as much as digits as its factorization.

195997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25515, while the sum is 40.

The square root of 195997 is about 442.7154842560. The cubic root of 195997 is about 58.0875609675.

The spelling of 195997 in words is "one hundred ninety-five thousand, nine hundred ninety-seven".