194238019 has 2 divisors, whose sum is σ = 194238020. Its totient is φ = 194238018.

The previous prime is 194238017. The next prime is 194238041. The reversal of 194238019 is 910832491.

It is a weak prime.

It is an emirp because it is prime and its reverse (910832491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194238019 - 2¹ = 194238017 is a prime.

It is a super-2 number, since 2×194238019² = 75456816050088722, which contains 22 as substring.

Together with 194238017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (194238017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97119009 + 97119010.

It is an arithmetic number, because the mean of its divisors is an integer number (97119010).

Almost surely, 2^194238019 is an apocalyptic number.

194238019 is a deficient number, since it is larger than the sum of its proper divisors (1).

194238019 is an equidigital number, since it uses as much as digits as its factorization.

194238019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 194238019 is about 13936.9300421578. The cubic root of 194238019 is about 579.1326900299.

The spelling of 194238019 in words is "one hundred ninety-four million, two hundred thirty-eight thousand, nineteen".