18338501 has 2 divisors, whose sum is σ = 18338502. Its totient is φ = 18338500.

The previous prime is 18338479. The next prime is 18338513. The reversal of 18338501 is 10583381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15007876 + 3330625 = 3874^2 + 1825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18338501 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18338531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9169250 + 9169251.

It is an arithmetic number, because the mean of its divisors is an integer number (9169251).

Almost surely, 2^18338501 is an apocalyptic number.

It is an amenable number.

18338501 is a deficient number, since it is larger than the sum of its proper divisors (1).

18338501 is an equidigital number, since it uses as much as digits as its factorization.

18338501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 18338501 is about 4282.3476038267. The cubic root of 18338501 is about 263.7067690426.

The spelling of 18338501 in words is "eighteen million, three hundred thirty-eight thousand, five hundred one".