19690019 has 2 divisors, whose sum is σ = 19690020. Its totient is φ = 19690018.

The previous prime is 19690003. The next prime is 19690037. The reversal of 19690019 is 91009691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19690019 - 2⁴ = 19690003 is a prime.

It is a super-2 number, since 2×19690019² = 775393696440722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19690049) 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, 9845009 + 9845010.

It is an arithmetic number, because the mean of its divisors is an integer number (9845010).

Almost surely, 2^19690019 is an apocalyptic number.

19690019 is a deficient number, since it is larger than the sum of its proper divisors (1).

19690019 is an equidigital number, since it uses as much as digits as its factorization.

19690019 is an odious number, because the sum of its binary digits is odd.

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

The square root of 19690019 is about 4437.3436873878. The cubic root of 19690019 is about 270.0320903788.

The spelling of 19690019 in words is "nineteen million, six hundred ninety thousand, nineteen".