194641919 has 2 divisors, whose sum is σ = 194641920. Its totient is φ = 194641918.

The previous prime is 194641913. The next prime is 194641921. The reversal of 194641919 is 919146491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 194641919 - 2⁴ = 194641903 is a prime.

It is a super-2 number, since 2×194641919² = 75770953264005122, which contains 22 as substring.

Together with 194641921, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 194641919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194641913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97320959 + 97320960.

It is an arithmetic number, because the mean of its divisors is an integer number (97320960).

Almost surely, 2^194641919 is an apocalyptic number.

194641919 is a deficient number, since it is larger than the sum of its proper divisors (1).

194641919 is an equidigital number, since it uses as much as digits as its factorization.

194641919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 194641919 is about 13951.4127958426. The cubic root of 194641919 is about 579.5338297401.

The spelling of 194641919 in words is "one hundred ninety-four million, six hundred forty-one thousand, nine hundred nineteen".