19019009 has 2 divisors, whose sum is σ = 19019010. Its totient is φ = 19019008.

The previous prime is 19018991. The next prime is 19019017. The reversal of 19019009 is 90091091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19009600 + 9409 = 4360^2 + 97^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19019009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19019069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9509504 + 9509505.

It is an arithmetic number, because the mean of its divisors is an integer number (9509505).

Almost surely, 2^19019009 is an apocalyptic number.

It is an amenable number.

19019009 is a deficient number, since it is larger than the sum of its proper divisors (1).

19019009 is an equidigital number, since it uses as much as digits as its factorization.

19019009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 19019009 is about 4361.0788802772. The cubic root of 19019009 is about 266.9291240660.

The spelling of 19019009 in words is "nineteen million, nineteen thousand, nine".