18271280149 has 2 divisors, whose sum is σ = 18271280150. Its totient is φ = 18271280148.

The previous prime is 18271280129. The next prime is 18271280173. The reversal of 18271280149 is 94108217281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14426412100 + 3844868049 = 120110^2 + 62007^2 .

It is a cyclic number.

It is not a de Polignac number, because 18271280149 - 2¹¹ = 18271278101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18271280129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9135640074 + 9135640075.

It is an arithmetic number, because the mean of its divisors is an integer number (9135640075).

Almost surely, 2^18271280149 is an apocalyptic number.

It is an amenable number.

18271280149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18271280149 is an equidigital number, since it uses as much as digits as its factorization.

18271280149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 43.

The spelling of 18271280149 in words is "eighteen billion, two hundred seventy-one million, two hundred eighty thousand, one hundred forty-nine".