195971 has 2 divisors, whose sum is σ = 195972. Its totient is φ = 195970.

The previous prime is 195967. The next prime is 195973. The reversal of 195971 is 179591.

It is a strong prime.

It is an emirp because it is prime and its reverse (179591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195971 - 2² = 195967 is a prime.

Together with 195973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195973) 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, 97985 + 97986.

It is an arithmetic number, because the mean of its divisors is an integer number (97986).

2¹⁹⁵⁹⁷¹ is an apocalyptic number.

195971 is a deficient number, since it is larger than the sum of its proper divisors (1).

195971 is an equidigital number, since it uses as much as digits as its factorization.

195971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2835, while the sum is 32.

The square root of 195971 is about 442.6861190505. The cubic root of 195971 is about 58.0849923170.

The spelling of 195971 in words is "one hundred ninety-five thousand, nine hundred seventy-one".