18054047281 has 4 divisors (see below), whose sum is σ = 18054332452. Its totient is φ = 18053762112.

The previous prime is 18054047273. The next prime is 18054047287. The reversal of 18054047281 is 18274045081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13475495056 + 4578552225 = 116084^2 + 67665^2 .

It is a cyclic number.

It is not a de Polignac number, because 18054047281 - 2³ = 18054047273 is a prime.

It is a super-2 number, since 2×18054047281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18054047287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276 + ... + 190021.

It is an arithmetic number, because the mean of its divisors is an integer number (4513583113).

Almost surely, 2^18054047281 is an apocalyptic number.

It is an amenable number.

18054047281 is a deficient number, since it is larger than the sum of its proper divisors (285171).

18054047281 is an equidigital number, since it uses as much as digits as its factorization.

18054047281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285170.

The product of its (nonzero) digits is 71680, while the sum is 40.

The spelling of 18054047281 in words is "eighteen billion, fifty-four million, forty-seven thousand, two hundred eighty-one".