18182201 has 2 divisors, whose sum is σ = 18182202. Its totient is φ = 18182200.

The previous prime is 18182149. The next prime is 18182251. The reversal of 18182201 is 10228181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16974400 + 1207801 = 4120^2 + 1099^2 .

It is a cyclic number.

It is not a de Polignac number, because 18182201 - 2⁶ = 18182137 is a prime.

It is not a weakly prime, because it can be changed into another prime (18182251) 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, 9091100 + 9091101.

It is an arithmetic number, because the mean of its divisors is an integer number (9091101).

Almost surely, 2^18182201 is an apocalyptic number.

It is an amenable number.

18182201 is a deficient number, since it is larger than the sum of its proper divisors (1).

18182201 is an equidigital number, since it uses as much as digits as its factorization.

18182201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 18182201 is about 4264.0592162868. The cubic root of 18182201 is about 262.9554349159.

The spelling of 18182201 in words is "eighteen million, one hundred eighty-two thousand, two hundred one".