19649089 has 2 divisors, whose sum is σ = 19649090. Its totient is φ = 19649088.

The previous prime is 19649087. The next prime is 19649099. The reversal of 19649089 is 98094691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13359025 + 6290064 = 3655^2 + 2508^2 .

It is an emirp because it is prime and its reverse (98094691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19649089 - 2¹ = 19649087 is a prime.

Together with 19649087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19649081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9824544 + 9824545.

It is an arithmetic number, because the mean of its divisors is an integer number (9824545).

Almost surely, 2^19649089 is an apocalyptic number.

It is an amenable number.

19649089 is a deficient number, since it is larger than the sum of its proper divisors (1).

19649089 is an equidigital number, since it uses as much as digits as its factorization.

19649089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 19649089 is about 4432.7292946897. The cubic root of 19649089 is about 269.8448537116.

The spelling of 19649089 in words is "nineteen million, six hundred forty-nine thousand, eighty-nine".