19689913 has 2 divisors, whose sum is σ = 19689914. Its totient is φ = 19689912.

The previous prime is 19689907. The next prime is 19689919. The reversal of 19689913 is 31998691.

It is a balanced prime because it is at equal distance from previous prime (19689907) and next prime (19689919).

It can be written as a sum of positive squares in only one way, i.e., 15657849 + 4032064 = 3957^2 + 2008^2 .

It is a cyclic number.

It is not a de Polignac number, because 19689913 - 2⁹ = 19689401 is a prime.

It is not a weakly prime, because it can be changed into another prime (19689919) 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, 9844956 + 9844957.

It is an arithmetic number, because the mean of its divisors is an integer number (9844957).

Almost surely, 2^19689913 is an apocalyptic number.

It is an amenable number.

19689913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19689913 is an equidigital number, since it uses as much as digits as its factorization.

19689913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 46.

The square root of 19689913 is about 4437.3317432890. The cubic root of 19689913 is about 270.0316058109.

It can be divided in two parts, 19689 and 913, that added together give a palindrome (20602).

The spelling of 19689913 in words is "nineteen million, six hundred eighty-nine thousand, nine hundred thirteen".