19984513 has 2 divisors, whose sum is σ = 19984514. Its totient is φ = 19984512.

The previous prime is 19984511. The next prime is 19984519. The reversal of 19984513 is 31548991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19784704 + 199809 = 4448^2 + 447^2 .

It is a cyclic number.

It is not a de Polignac number, because 19984513 - 2¹ = 19984511 is a prime.

Together with 19984511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19984511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9992256 + 9992257.

It is an arithmetic number, because the mean of its divisors is an integer number (9992257).

Almost surely, 2^19984513 is an apocalyptic number.

It is an amenable number.

19984513 is a deficient number, since it is larger than the sum of its proper divisors (1).

19984513 is an equidigital number, since it uses as much as digits as its factorization.

19984513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 40.

The square root of 19984513 is about 4470.4041204348. The cubic root of 19984513 is about 271.3716799244.

The spelling of 19984513 in words is "nineteen million, nine hundred eighty-four thousand, five hundred thirteen".