18054521 has 2 divisors, whose sum is σ = 18054522. Its totient is φ = 18054520.

The previous prime is 18054511. The next prime is 18054577. The reversal of 18054521 is 12545081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9120400 + 8934121 = 3020^2 + 2989^2 .

It is a cyclic number.

It is not a de Polignac number, because 18054521 - 2¹⁸ = 17792377 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18054511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9027260 + 9027261.

It is an arithmetic number, because the mean of its divisors is an integer number (9027261).

Almost surely, 2^18054521 is an apocalyptic number.

It is an amenable number.

18054521 is a deficient number, since it is larger than the sum of its proper divisors (1).

18054521 is an equidigital number, since it uses as much as digits as its factorization.

18054521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 18054521 is about 4249.0611904278. The cubic root of 18054521 is about 262.3384753835.

The spelling of 18054521 in words is "eighteen million, fifty-four thousand, five hundred twenty-one".