19089409 has 2 divisors, whose sum is σ = 19089410. Its totient is φ = 19089408.

The previous prime is 19089359. The next prime is 19089431. The reversal of 19089409 is 90498091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10909809 + 8179600 = 3303^2 + 2860^2 .

It is a cyclic number.

It is not a de Polignac number, because 19089409 - 2¹⁷ = 18958337 is a prime.

It is not a weakly prime, because it can be changed into another prime (19089479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9544704 + 9544705.

It is an arithmetic number, because the mean of its divisors is an integer number (9544705).

Almost surely, 2^19089409 is an apocalyptic number.

It is an amenable number.

19089409 is a deficient number, since it is larger than the sum of its proper divisors (1).

19089409 is an equidigital number, since it uses as much as digits as its factorization.

19089409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 19089409 is about 4369.1428221105. The cubic root of 19089409 is about 267.2580699040.

The spelling of 19089409 in words is "nineteen million, eighty-nine thousand, four hundred nine".