18127161 has 12 divisors (see below), whose sum is σ = 28197988. Its totient is φ = 11155104.

The previous prime is 18127127. The next prime is 18127163. The reversal of 18127161 is 16172181.

It can be written as a sum of positive squares in 2 ways, for example, as 11594025 + 6533136 = 3405^2 + 2556^2 .

It is not a de Polignac number, because 18127161 - 2¹⁴ = 18110777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18127163) 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 11 ways as a sum of consecutive naturals, for example, 77350 + ... + 77583.

Almost surely, 2^18127161 is an apocalyptic number.

It is an amenable number.

18127161 is a deficient number, since it is larger than the sum of its proper divisors (10070827).

18127161 is a wasteful number, since it uses less digits than its factorization.

18127161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154952 (or 154949 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 18127161 is about 4257.6003804960. The cubic root of 18127161 is about 262.6898327531.

The spelling of 18127161 in words is "eighteen million, one hundred twenty-seven thousand, one hundred sixty-one".