19123919 has 2 divisors, whose sum is σ = 19123920. Its totient is φ = 19123918.

The previous prime is 19123913. The next prime is 19123969. The reversal of 19123919 is 91932191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19123919 - 2⁴ = 19123903 is a prime.

It is a super-2 number, since 2×19123919² = 731448555837122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19123913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9561959 + 9561960.

It is an arithmetic number, because the mean of its divisors is an integer number (9561960).

Almost surely, 2^19123919 is an apocalyptic number.

19123919 is a deficient number, since it is larger than the sum of its proper divisors (1).

19123919 is an equidigital number, since it uses as much as digits as its factorization.

19123919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 35.

The square root of 19123919 is about 4373.0903260738. The cubic root of 19123919 is about 267.4190234414.

The spelling of 19123919 in words is "nineteen million, one hundred twenty-three thousand, nine hundred nineteen".