19081409 has 2 divisors, whose sum is σ = 19081410. Its totient is φ = 19081408.

The previous prime is 19081373. The next prime is 19081411. The reversal of 19081409 is 90418091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12816400 + 6265009 = 3580^2 + 2503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19081409 is a prime.

Together with 19081411, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1215887 and since 19081409 and 1215887 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (19081459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9540704 + 9540705.

It is an arithmetic number, because the mean of its divisors is an integer number (9540705).

Almost surely, 2^19081409 is an apocalyptic number.

It is an amenable number.

19081409 is a deficient number, since it is larger than the sum of its proper divisors (1).

19081409 is an equidigital number, since it uses as much as digits as its factorization.

19081409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 19081409 is about 4368.2272147863. The cubic root of 19081409 is about 267.2207304679.

The spelling of 19081409 in words is "nineteen million, eighty-one thousand, four hundred nine".