19139819 has 2 divisors, whose sum is σ = 19139820. Its totient is φ = 19139818.

The previous prime is 19139801. The next prime is 19139833. The reversal of 19139819 is 91893191.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19139819 - 2¹² = 19135723 is a prime.

It is a super-2 number, since 2×19139819² = 732665342705522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19139849) 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 as a sum of consecutive naturals, namely, 9569909 + 9569910.

It is an arithmetic number, because the mean of its divisors is an integer number (9569910).

Almost surely, 2^19139819 is an apocalyptic number.

19139819 is a deficient number, since it is larger than the sum of its proper divisors (1).

19139819 is an equidigital number, since it uses as much as digits as its factorization.

19139819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 41.

The square root of 19139819 is about 4374.9078847445. The cubic root of 19139819 is about 267.4931153788.

The spelling of 19139819 in words is "nineteen million, one hundred thirty-nine thousand, eight hundred nineteen".