18055801 has 2 divisors, whose sum is σ = 18055802. Its totient is φ = 18055800.

The previous prime is 18055799. The next prime is 18055813. The reversal of 18055801 is 10855081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16192576 + 1863225 = 4024^2 + 1365^2 .

It is a cyclic number.

It is not a de Polignac number, because 18055801 - 2¹ = 18055799 is a prime.

Together with 18055799, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18055801.

It is not a weakly prime, because it can be changed into another prime (18055841) 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, 9027900 + 9027901.

It is an arithmetic number, because the mean of its divisors is an integer number (9027901).

Almost surely, 2^18055801 is an apocalyptic number.

It is an amenable number.

18055801 is a deficient number, since it is larger than the sum of its proper divisors (1).

18055801 is an equidigital number, since it uses as much as digits as its factorization.

18055801 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 28.

The square root of 18055801 is about 4249.2118092653. The cubic root of 18055801 is about 262.3446748522.

The spelling of 18055801 in words is "eighteen million, fifty-five thousand, eight hundred one".