18405061 has 2 divisors, whose sum is σ = 18405062. Its totient is φ = 18405060.

The previous prime is 18405047. The next prime is 18405089. The reversal of 18405061 is 16050481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 961 = 4290^2 + 31^2 .

It is a cyclic number.

It is not a de Polignac number, because 18405061 - 2⁵ = 18405029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18405011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9202530 + 9202531.

It is an arithmetic number, because the mean of its divisors is an integer number (9202531).

Almost surely, 2^18405061 is an apocalyptic number.

It is an amenable number.

18405061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18405061 is an equidigital number, since it uses as much as digits as its factorization.

18405061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 18405061 is about 4290.1120031999. The cubic root of 18405061 is about 264.0254270352.

The spelling of 18405061 in words is "eighteen million, four hundred five thousand, sixty-one".