19648913 has 2 divisors, whose sum is σ = 19648914. Its totient is φ = 19648912.

The previous prime is 19648903. The next prime is 19648931. The reversal of 19648913 is 31984691.

Together with next prime (19648931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19298449 + 350464 = 4393^2 + 592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19648913 is a prime.

It is not a weakly prime, because it can be changed into another prime (19648903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9824456 + 9824457.

It is an arithmetic number, because the mean of its divisors is an integer number (9824457).

Almost surely, 2^19648913 is an apocalyptic number.

It is an amenable number.

19648913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19648913 is an equidigital number, since it uses as much as digits as its factorization.

19648913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 19648913 is about 4432.7094423163. The cubic root of 19648913 is about 269.8440480282.

The spelling of 19648913 in words is "nineteen million, six hundred forty-eight thousand, nine hundred thirteen".