19616489 has 2 divisors, whose sum is σ = 19616490. Its totient is φ = 19616488.

The previous prime is 19616449. The next prime is 19616501. The reversal of 19616489 is 98461691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19536400 + 80089 = 4420^2 + 283^2 .

It is a cyclic number.

It is not a de Polignac number, because 19616489 - 2¹⁶ = 19550953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19616449) 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, 9808244 + 9808245.

It is an arithmetic number, because the mean of its divisors is an integer number (9808245).

Almost surely, 2^19616489 is an apocalyptic number.

It is an amenable number.

19616489 is a deficient number, since it is larger than the sum of its proper divisors (1).

19616489 is an equidigital number, since it uses as much as digits as its factorization.

19616489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 19616489 is about 4429.0505754620. The cubic root of 19616489 is about 269.6955370054.

The spelling of 19616489 in words is "nineteen million, six hundred sixteen thousand, four hundred eighty-nine".