195919 has 2 divisors, whose sum is σ = 195920. Its totient is φ = 195918.

The previous prime is 195913. The next prime is 195929. The reversal of 195919 is 919591.

It is a weak prime.

It is an emirp because it is prime and its reverse (919591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195919 - 2⁵ = 195887 is a prime.

It is a super-2 number, since 2×195919² = 76768509122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195913) 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, 97959 + 97960.

It is an arithmetic number, because the mean of its divisors is an integer number (97960).

2¹⁹⁵⁹¹⁹ is an apocalyptic number.

195919 is a deficient number, since it is larger than the sum of its proper divisors (1).

195919 is an equidigital number, since it uses as much as digits as its factorization.

195919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3645, while the sum is 34.

The square root of 195919 is about 442.6273827951. The cubic root of 195919 is about 58.0798543344.

It can be divided in two parts, 19591 and 9, that added together give a square (19600 = 140²).

The spelling of 195919 in words is "one hundred ninety-five thousand, nine hundred nineteen".