19139009 has 2 divisors, whose sum is σ = 19139010. Its totient is φ = 19139008.

The previous prime is 19138993. The next prime is 19139017. The reversal of 19139009 is 90093191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 7579009 = 3400^2 + 2753^2 .

It is a cyclic number.

It is not a de Polignac number, because 19139009 - 2⁴ = 19138993 is a prime.

It is a super-3 number, since 3×19139009³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (19139039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9569504 + 9569505.

It is an arithmetic number, because the mean of its divisors is an integer number (9569505).

Almost surely, 2^19139009 is an apocalyptic number.

It is an amenable number.

19139009 is a deficient number, since it is larger than the sum of its proper divisors (1).

19139009 is an equidigital number, since it uses as much as digits as its factorization.

19139009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 19139009 is about 4374.8153103874. The cubic root of 19139009 is about 267.4893418760.

The spelling of 19139009 in words is "nineteen million, one hundred thirty-nine thousand, nine".