18055291 has 2 divisors, whose sum is σ = 18055292. Its totient is φ = 18055290.

The previous prime is 18055283. The next prime is 18055327. The reversal of 18055291 is 19255081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18055291 - 2³ = 18055283 is a prime.

It is not a weakly prime, because it can be changed into another prime (18055201) 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, 9027645 + 9027646.

It is an arithmetic number, because the mean of its divisors is an integer number (9027646).

Almost surely, 2^18055291 is an apocalyptic number.

18055291 is a deficient number, since it is larger than the sum of its proper divisors (1).

18055291 is an equidigital number, since it uses as much as digits as its factorization.

18055291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 18055291 is about 4249.1517977121. The cubic root of 18055291 is about 262.3422047865.

The spelling of 18055291 in words is "eighteen million, fifty-five thousand, two hundred ninety-one".