19849117 has 2 divisors, whose sum is σ = 19849118. Its totient is φ = 19849116.

The previous prime is 19849111. The next prime is 19849121. The reversal of 19849117 is 71194891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13351716 + 6497401 = 3654^2 + 2549^2 .

It is an emirp because it is prime and its reverse (71194891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19849117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19849117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19849111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9924558 + 9924559.

It is an arithmetic number, because the mean of its divisors is an integer number (9924559).

Almost surely, 2^19849117 is an apocalyptic number.

It is an amenable number.

19849117 is a deficient number, since it is larger than the sum of its proper divisors (1).

19849117 is an equidigital number, since it uses as much as digits as its factorization.

19849117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 40.

The square root of 19849117 is about 4455.2347861813. The cubic root of 19849117 is about 270.7574387633.

The spelling of 19849117 in words is "nineteen million, eight hundred forty-nine thousand, one hundred seventeen".