18077161 has 4 divisors (see below), whose sum is σ = 18087300. Its totient is φ = 18067024.

The previous prime is 18077159. The next prime is 18077173. The reversal of 18077161 is 16177081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8590761 + 9486400 = 2931^2 + 3080^2 .

It is a cyclic number.

It is not a de Polignac number, because 18077161 - 2¹ = 18077159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18077131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1606 + ... + 6223.

It is an arithmetic number, because the mean of its divisors is an integer number (4521825).

Almost surely, 2^18077161 is an apocalyptic number.

It is an amenable number.

18077161 is a deficient number, since it is larger than the sum of its proper divisors (10139).

18077161 is an equidigital number, since it uses as much as digits as its factorization.

18077161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10138.

The product of its (nonzero) digits is 2352, while the sum is 31.

The square root of 18077161 is about 4251.7244736695. The cubic root of 18077161 is about 262.4480852739.

The spelling of 18077161 in words is "eighteen million, seventy-seven thousand, one hundred sixty-one".