18385361 has 2 divisors, whose sum is σ = 18385362. Its totient is φ = 18385360.

The previous prime is 18385351. The next prime is 18385363. The reversal of 18385361 is 16358381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17272336 + 1113025 = 4156^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 18385361 - 2²² = 14191057 is a prime.

Together with 18385363, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18385363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9192680 + 9192681.

It is an arithmetic number, because the mean of its divisors is an integer number (9192681).

Almost surely, 2^18385361 is an apocalyptic number.

It is an amenable number.

18385361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18385361 is an equidigital number, since it uses as much as digits as its factorization.

18385361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 18385361 is about 4287.8154111389. The cubic root of 18385361 is about 263.9311928502.

The spelling of 18385361 in words is "eighteen million, three hundred eighty-five thousand, three hundred sixty-one".