195871001 has 2 divisors, whose sum is σ = 195871002. Its totient is φ = 195871000.

The previous prime is 195870979. The next prime is 195871003. The reversal of 195871001 is 100178591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164454976 + 31416025 = 12824^2 + 5605^2 .

It is a cyclic number.

It is not a de Polignac number, because 195871001 - 2⁶ = 195870937 is a prime.

Together with 195871003, 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 (195871003) 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, 97935500 + 97935501.

It is an arithmetic number, because the mean of its divisors is an integer number (97935501).

Almost surely, 2^195871001 is an apocalyptic number.

It is an amenable number.

195871001 is a deficient number, since it is larger than the sum of its proper divisors (1).

195871001 is an equidigital number, since it uses as much as digits as its factorization.

195871001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 32.

The square root of 195871001 is about 13995.3921345563. The cubic root of 195871001 is about 580.7511087300.

The spelling of 195871001 in words is "one hundred ninety-five million, eight hundred seventy-one thousand, one".