18498281 has 4 divisors (see below), whose sum is σ = 18668100. Its totient is φ = 18328464.

The previous prime is 18498247. The next prime is 18498301. The reversal of 18498281 is 18289481.

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 13249600 + 5248681 = 3640^2 + 2291^2 .

It is a cyclic number.

It is not a de Polignac number, because 18498281 - 2¹⁰ = 18497257 is a prime.

It is a super-2 number, since 2×18498281² = 684372799909922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18498241) 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 in 3 ways as a sum of consecutive naturals, for example, 84746 + ... + 84963.

It is an arithmetic number, because the mean of its divisors is an integer number (4667025).

Almost surely, 2^18498281 is an apocalyptic number.

It is an amenable number.

18498281 is a deficient number, since it is larger than the sum of its proper divisors (169819).

18498281 is a wasteful number, since it uses less digits than its factorization.

18498281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169818.

The product of its digits is 36864, while the sum is 41.

The square root of 18498281 is about 4300.9627991881. The cubic root of 18498281 is about 264.4704316917.

It can be divided in two parts, 1849 and 8281, that multiplied together give a square (15311569 = 3913²).

The spelling of 18498281 in words is "eighteen million, four hundred ninety-eight thousand, two hundred eighty-one".