18121065 has 32 divisors (see below), whose sum is σ = 30948480. Its totient is φ = 9022464.

The previous prime is 18121043. The next prime is 18121067. The reversal of 18121065 is 56012181.

It is not a de Polignac number, because 18121065 - 2⁷ = 18120937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18121067) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45447 + ... + 45843.

It is an arithmetic number, because the mean of its divisors is an integer number (967140).

Almost surely, 2^18121065 is an apocalyptic number.

18121065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18121065 is a deficient number, since it is larger than the sum of its proper divisors (12827415).

18121065 is a wasteful number, since it uses less digits than its factorization.

18121065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 18121065 is about 4256.8844240829. The cubic root of 18121065 is about 262.6603827148.

The spelling of 18121065 in words is "eighteen million, one hundred twenty-one thousand, sixty-five".