19818103 has 2 divisors, whose sum is σ = 19818104. Its totient is φ = 19818102.

The previous prime is 19818101. The next prime is 19818137. The reversal of 19818103 is 30181891.

It is a weak prime.

It is an emirp because it is prime and its reverse (30181891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19818103 - 2¹ = 19818101 is a prime.

Together with 19818101, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19818101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9909051 + 9909052.

It is an arithmetic number, because the mean of its divisors is an integer number (9909052).

Almost surely, 2^19818103 is an apocalyptic number.

19818103 is a deficient number, since it is larger than the sum of its proper divisors (1).

19818103 is an equidigital number, since it uses as much as digits as its factorization.

19818103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 19818103 is about 4451.7528008639. The cubic root of 19818103 is about 270.6163468690.

Adding to 19818103 its reverse (30181891), we get a palindrome (49999994).

The spelling of 19818103 in words is "nineteen million, eight hundred eighteen thousand, one hundred three".