195977 has 2 divisors, whose sum is σ = 195978. Its totient is φ = 195976.

The previous prime is 195973. The next prime is 195991. The reversal of 195977 is 779591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163216 + 32761 = 404^2 + 181^2 .

It is an emirp because it is prime and its reverse (779591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195977 - 2² = 195973 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195977.

It is not a weakly prime, because it can be changed into another prime (195971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97988 + 97989.

It is an arithmetic number, because the mean of its divisors is an integer number (97989).

2¹⁹⁵⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

195977 is a deficient number, since it is larger than the sum of its proper divisors (1).

195977 is an equidigital number, since it uses as much as digits as its factorization.

195977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19845, while the sum is 38.

The square root of 195977 is about 442.6928958093. The cubic root of 195977 is about 58.0855851027.

The spelling of 195977 in words is "one hundred ninety-five thousand, nine hundred seventy-seven".