18136771 has 4 divisors (see below), whose sum is σ = 18626992. Its totient is φ = 17646552.

The previous prime is 18136763. The next prime is 18136793. The reversal of 18136771 is 17763181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17763181 = 17 ⋅1044893.

It is a cyclic number.

It is not a de Polignac number, because 18136771 - 2³ = 18136763 is a prime.

It is a super-3 number, since 3×18136771³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18136721) 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, 245055 + ... + 245128.

It is an arithmetic number, because the mean of its divisors is an integer number (4656748).

Almost surely, 2^18136771 is an apocalyptic number.

18136771 is a deficient number, since it is larger than the sum of its proper divisors (490221).

18136771 is an equidigital number, since it uses as much as digits as its factorization.

18136771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490220.

The product of its digits is 7056, while the sum is 34.

The square root of 18136771 is about 4258.7288009452. The cubic root of 18136771 is about 262.7362456712.

The spelling of 18136771 in words is "eighteen million, one hundred thirty-six thousand, seven hundred seventy-one".