19135009 has 2 divisors, whose sum is σ = 19135010. Its totient is φ = 19135008.

The previous prime is 19135007. The next prime is 19135079. The reversal of 19135009 is 90053191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18190225 + 944784 = 4265^2 + 972^2 .

It is an emirp because it is prime and its reverse (90053191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19135009 - 2¹ = 19135007 is a prime.

It is a super-2 number, since 2×19135009² = 732297138860162, which contains 22 as substring.

Together with 19135007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19135007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9567504 + 9567505.

It is an arithmetic number, because the mean of its divisors is an integer number (9567505).

Almost surely, 2^19135009 is an apocalyptic number.

It is an amenable number.

19135009 is a deficient number, since it is larger than the sum of its proper divisors (1).

19135009 is an equidigital number, since it uses as much as digits as its factorization.

19135009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1215, while the sum is 28.

The square root of 19135009 is about 4374.3581243424. The cubic root of 19135009 is about 267.4707057332.

The spelling of 19135009 in words is "nineteen million, one hundred thirty-five thousand, nine".