19989113 has 2 divisors, whose sum is σ = 19989114. Its totient is φ = 19989112.

The previous prime is 19989103. The next prime is 19989131. The reversal of 19989113 is 31198991.

It is a happy number.

Together with next prime (19989131) 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., 11648569 + 8340544 = 3413^2 + 2888^2 .

It is a cyclic number.

It is not a de Polignac number, because 19989113 - 2⁶ = 19989049 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19989103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994556 + 9994557.

It is an arithmetic number, because the mean of its divisors is an integer number (9994557).

Almost surely, 2^19989113 is an apocalyptic number.

It is an amenable number.

19989113 is a deficient number, since it is larger than the sum of its proper divisors (1).

19989113 is an equidigital number, since it uses as much as digits as its factorization.

19989113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 41.

The square root of 19989113 is about 4470.9185857047. The cubic root of 19989113 is about 271.3924996122.

It can be divided in two parts, 19989 and 113, that added together give a palindrome (20102).

The spelling of 19989113 in words is "nineteen million, nine hundred eighty-nine thousand, one hundred thirteen".