18282561 has 8 divisors (see below), whose sum is σ = 26592864. Its totient is φ = 11080320.

The previous prime is 18282553. The next prime is 18282619. The reversal of 18282561 is 16528281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18282561 - 2³ = 18282553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 554017 = 18282561 / (1 + 8 + 2 + 8 + 2 + 5 + 6 + 1).

It is not an unprimeable number, because it can be changed into a prime (18282521) 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 7 ways as a sum of consecutive naturals, for example, 276976 + ... + 277041.

It is an arithmetic number, because the mean of its divisors is an integer number (3324108).

Almost surely, 2^18282561 is an apocalyptic number.

18282561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18282561 is a deficient number, since it is larger than the sum of its proper divisors (8310303).

18282561 is a wasteful number, since it uses less digits than its factorization.

18282561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554031.

The product of its digits is 7680, while the sum is 33.

The square root of 18282561 is about 4275.8111511151. The cubic root of 18282561 is about 263.4383577589.

The spelling of 18282561 in words is "eighteen million, two hundred eighty-two thousand, five hundred sixty-one".