54018221 has 2 divisors, whose sum is σ = 54018222. Its totient is φ = 54018220.

The previous prime is 54018203. The next prime is 54018227. The reversal of 54018221 is 12281045.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45832900 + 8185321 = 6770^2 + 2861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54018221 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54018227) 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, 27009110 + 27009111.

It is an arithmetic number, because the mean of its divisors is an integer number (27009111).

Almost surely, 2^54018221 is an apocalyptic number.

It is an amenable number.

54018221 is a deficient number, since it is larger than the sum of its proper divisors (1).

54018221 is an equidigital number, since it uses as much as digits as its factorization.

54018221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 54018221 is about 7349.7089058003. The cubic root of 54018221 is about 378.0188231904.

Adding to 54018221 its reverse (12281045), we get a palindrome (66299266).

The spelling of 54018221 in words is "fifty-four million, eighteen thousand, two hundred twenty-one".