18916241 has 2 divisors, whose sum is σ = 18916242. Its totient is φ = 18916240.

The previous prime is 18916217. The next prime is 18916243. The reversal of 18916241 is 14261981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10627600 + 8288641 = 3260^2 + 2879^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18916241 is a prime.

Together with 18916243, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18916198 and 18916207.

It is not a weakly prime, because it can be changed into another prime (18916243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9458120 + 9458121.

It is an arithmetic number, because the mean of its divisors is an integer number (9458121).

Almost surely, 2^18916241 is an apocalyptic number.

It is an amenable number.

18916241 is a deficient number, since it is larger than the sum of its proper divisors (1).

18916241 is an equidigital number, since it uses as much as digits as its factorization.

18916241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 32.

The square root of 18916241 is about 4349.2805152117. The cubic root of 18916241 is about 266.4474773498.

The spelling of 18916241 in words is "eighteen million, nine hundred sixteen thousand, two hundred forty-one".