19669913 has 2 divisors, whose sum is σ = 19669914. Its totient is φ = 19669912.

The previous prime is 19669907. The next prime is 19669931. The reversal of 19669913 is 31996691.

It is a happy number.

Together with next prime (19669931) 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., 16752649 + 2917264 = 4093^2 + 1708^2 .

It is an emirp because it is prime and its reverse (31996691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19669913 - 2⁶ = 19669849 is a prime.

It is not a weakly prime, because it can be changed into another prime (19669213) 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, 9834956 + 9834957.

It is an arithmetic number, because the mean of its divisors is an integer number (9834957).

Almost surely, 2^19669913 is an apocalyptic number.

It is an amenable number.

19669913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19669913 is an equidigital number, since it uses as much as digits as its factorization.

19669913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 44.

The square root of 19669913 is about 4435.0775641470. The cubic root of 19669913 is about 269.9401467694.

The spelling of 19669913 in words is "nineteen million, six hundred sixty-nine thousand, nine hundred thirteen".