18424313 has 2 divisors, whose sum is σ = 18424314. Its totient is φ = 18424312.

The previous prime is 18424279. The next prime is 18424321. The reversal of 18424313 is 31342481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15155449 + 3268864 = 3893^2 + 1808^2 .

It is an emirp because it is prime and its reverse (31342481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18424313 - 2¹⁴ = 18407929 is a prime.

It is not a weakly prime, because it can be changed into another prime (18424333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9212156 + 9212157.

It is an arithmetic number, because the mean of its divisors is an integer number (9212157).

Almost surely, 2^18424313 is an apocalyptic number.

It is an amenable number.

18424313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18424313 is an equidigital number, since it uses as much as digits as its factorization.

18424313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 26.

The square root of 18424313 is about 4292.3551810166. The cubic root of 18424313 is about 264.1174532853.

Adding to 18424313 its reverse (31342481), we get a palindrome (49766794).

The spelling of 18424313 in words is "eighteen million, four hundred twenty-four thousand, three hundred thirteen".