18320311 has 2 divisors, whose sum is σ = 18320312. Its totient is φ = 18320310.

The previous prime is 18320261. The next prime is 18320321. The reversal of 18320311 is 11302381.

It is a strong prime.

It is an emirp because it is prime and its reverse (11302381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18320311 - 2¹⁵ = 18287543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18320321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9160155 + 9160156.

It is an arithmetic number, because the mean of its divisors is an integer number (9160156).

Almost surely, 2^18320311 is an apocalyptic number.

18320311 is a deficient number, since it is larger than the sum of its proper divisors (1).

18320311 is an equidigital number, since it uses as much as digits as its factorization.

18320311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 18320311 is about 4280.2232418415. The cubic root of 18320311 is about 263.6195497546.

Adding to 18320311 its reverse (11302381), we get a palindrome (29622692).

The spelling of 18320311 in words is "eighteen million, three hundred twenty thousand, three hundred eleven".