195690819 has 4 divisors (see below), whose sum is σ = 260921096. Its totient is φ = 130460544.

The previous prime is 195690799. The next prime is 195690863. The reversal of 195690819 is 918096591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 918096591 = 3 ⋅306032197.

It is not a de Polignac number, because 195690819 - 2⁹ = 195690307 is a prime.

It is a super-2 number, since 2×195690819² = 76589793281781522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195691819) 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 in 3 ways as a sum of consecutive naturals, for example, 32615134 + ... + 32615139.

It is an arithmetic number, because the mean of its divisors is an integer number (65230274).

Almost surely, 2^195690819 is an apocalyptic number.

195690819 is a deficient number, since it is larger than the sum of its proper divisors (65230277).

195690819 is an equidigital number, since it uses as much as digits as its factorization.

195690819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65230276.

The product of its (nonzero) digits is 174960, while the sum is 48.

The square root of 195690819 is about 13988.9534633582. The cubic root of 195690819 is about 580.5729761860.

The spelling of 195690819 in words is "one hundred ninety-five million, six hundred ninety thousand, eight hundred nineteen".