194417819 has 2 divisors, whose sum is σ = 194417820. Its totient is φ = 194417818.

The previous prime is 194417767. The next prime is 194417837. The reversal of 194417819 is 918714491.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (918714491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194417819 is a prime.

It is a super-2 number, since 2×194417819² = 75596576689433522, which contains 22 as substring.

It is a Chen prime.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 194417819.

It is not a weakly prime, because it can be changed into another prime (194417879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97208909 + 97208910.

It is an arithmetic number, because the mean of its divisors is an integer number (97208910).

Almost surely, 2^194417819 is an apocalyptic number.

194417819 is a deficient number, since it is larger than the sum of its proper divisors (1).

194417819 is an equidigital number, since it uses as much as digits as its factorization.

194417819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 194417819 is about 13943.3790380955. The cubic root of 194417819 is about 579.3113298680.

The spelling of 194417819 in words is "one hundred ninety-four million, four hundred seventeen thousand, eight hundred nineteen".