19134509 has 2 divisors, whose sum is σ = 19134510. Its totient is φ = 19134508.

The previous prime is 19134487. The next prime is 19134529. The reversal of 19134509 is 90543191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16564900 + 2569609 = 4070^2 + 1603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19134509 is a prime.

It is a super-2 number, since 2×19134509² = 732258869342162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19134529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9567254 + 9567255.

It is an arithmetic number, because the mean of its divisors is an integer number (9567255).

Almost surely, 2^19134509 is an apocalyptic number.

It is an amenable number.

19134509 is a deficient number, since it is larger than the sum of its proper divisors (1).

19134509 is an equidigital number, since it uses as much as digits as its factorization.

19134509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 19134509 is about 4374.3009727270. The cubic root of 19134509 is about 267.4683760327.

The spelling of 19134509 in words is "nineteen million, one hundred thirty-four thousand, five hundred nine".