18103193 has 2 divisors, whose sum is σ = 18103194. Its totient is φ = 18103192.

The previous prime is 18103159. The next prime is 18103201. The reversal of 18103193 is 39130181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16908544 + 1194649 = 4112^2 + 1093^2 .

It is an emirp because it is prime and its reverse (39130181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18103193 - 2¹⁰ = 18102169 is a prime.

It is not a weakly prime, because it can be changed into another prime (18103123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9051596 + 9051597.

It is an arithmetic number, because the mean of its divisors is an integer number (9051597).

Almost surely, 2^18103193 is an apocalyptic number.

It is an amenable number.

18103193 is a deficient number, since it is larger than the sum of its proper divisors (1).

18103193 is an equidigital number, since it uses as much as digits as its factorization.

18103193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 18103193 is about 4254.7847184082. The cubic root of 18103193 is about 262.5740042292.

The spelling of 18103193 in words is "eighteen million, one hundred three thousand, one hundred ninety-three".