18064581 has 8 divisors (see below), whose sum is σ = 24107424. Its totient is φ = 12032400.

The previous prime is 18064567. The next prime is 18064603. The reversal of 18064581 is 18546081.

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

It is not a de Polignac number, because 18064581 - 2⁵ = 18064549 is a prime.

It is a super-2 number, since 2×18064581² = 652658173411122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18064511) 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, 3031 + ... + 6731.

It is an arithmetic number, because the mean of its divisors is an integer number (3013428).

Almost surely, 2^18064581 is an apocalyptic number.

It is an amenable number.

18064581 is a deficient number, since it is larger than the sum of its proper divisors (6042843).

18064581 is a wasteful number, since it uses less digits than its factorization.

18064581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5331.

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

The square root of 18064581 is about 4250.2448164782. The cubic root of 18064581 is about 262.3871914371.

The spelling of 18064581 in words is "eighteen million, sixty-four thousand, five hundred eighty-one".