18103313 has 2 divisors, whose sum is σ = 18103314. Its totient is φ = 18103312.

The previous prime is 18103307. The next prime is 18103331. The reversal of 18103313 is 31330181.

It is a happy number.

Together with next prime (18103331) 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., 16785409 + 1317904 = 4097^2 + 1148^2 .

It is a cyclic number.

It is not a de Polignac number, because 18103313 - 2¹⁰ = 18102289 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 (18103373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9051656 + 9051657.

It is an arithmetic number, because the mean of its divisors is an integer number (9051657).

Almost surely, 2^18103313 is an apocalyptic number.

It is an amenable number.

18103313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18103313 is an equidigital number, since it uses as much as digits as its factorization.

18103313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 18103313 is about 4254.7988201559. The cubic root of 18103313 is about 262.5745843996.

Adding to 18103313 its reverse (31330181), we get a palindrome (49433494).

The spelling of 18103313 in words is "eighteen million, one hundred three thousand, three hundred thirteen".