18058861 has 2 divisors, whose sum is σ = 18058862. Its totient is φ = 18058860.

The previous prime is 18058829. The next prime is 18058877. The reversal of 18058861 is 16885081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17589636 + 469225 = 4194^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 18058861 - 2⁵ = 18058829 is a prime.

It is a super-2 number, since 2×18058861² = 652244921234642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18058861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18058361) 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 as a sum of consecutive naturals, namely, 9029430 + 9029431.

It is an arithmetic number, because the mean of its divisors is an integer number (9029431).

Almost surely, 2^18058861 is an apocalyptic number.

It is an amenable number.

18058861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18058861 is an equidigital number, since it uses as much as digits as its factorization.

18058861 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18058861 is about 4249.5718607879. The cubic root of 18058861 is about 262.3594942697.

The spelling of 18058861 in words is "eighteen million, fifty-eight thousand, eight hundred sixty-one".