18711241 has 2 divisors, whose sum is σ = 18711242. Its totient is φ = 18711240.

The previous prime is 18711239. The next prime is 18711247. The reversal of 18711241 is 14211781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 48841 = 4320^2 + 221^2 .

It is an emirp because it is prime and its reverse (14211781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18711241 - 2¹ = 18711239 is a prime.

It is a super-2 number, since 2×18711241² = 700221079520162, which contains 22 as substring.

Together with 18711239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18711247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9355620 + 9355621.

It is an arithmetic number, because the mean of its divisors is an integer number (9355621).

Almost surely, 2^18711241 is an apocalyptic number.

It is an amenable number.

18711241 is a deficient number, since it is larger than the sum of its proper divisors (1).

18711241 is an equidigital number, since it uses as much as digits as its factorization.

18711241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 448, while the sum is 25.

The square root of 18711241 is about 4325.6491998312. The cubic root of 18711241 is about 265.4814600895.

The spelling of 18711241 in words is "eighteen million, seven hundred eleven thousand, two hundred forty-one".