18058681 has 4 divisors (see below), whose sum is σ = 18234112. Its totient is φ = 17883252.

The previous prime is 18058673. The next prime is 18058687. The reversal of 18058681 is 18685081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18058681 - 2³ = 18058673 is a prime.

It is a super-2 number, since 2×18058681² = 652231918919522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18058681.

It is not an unprimeable number, because it can be changed into a prime (18058687) 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 in 3 ways as a sum of consecutive naturals, for example, 87561 + ... + 87766.

It is an arithmetic number, because the mean of its divisors is an integer number (4558528).

Almost surely, 2^18058681 is an apocalyptic number.

It is an amenable number.

18058681 is a deficient number, since it is larger than the sum of its proper divisors (175431).

18058681 is a wasteful number, since it uses less digits than its factorization.

18058681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175430.

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 18058681 is about 4249.5506821310. The cubic root of 18058681 is about 262.3586225856.

The spelling of 18058681 in words is "eighteen million, fifty-eight thousand, six hundred eighty-one".