218046161 has 4 divisors (see below), whose sum is σ = 218111412. Its totient is φ = 217980912.

The previous prime is 218046151. The next prime is 218046181. The reversal of 218046161 is 161640812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95257600 + 122788561 = 9760^2 + 11081^2 .

It is a cyclic number.

It is not a de Polignac number, because 218046161 - 2¹⁰ = 218045137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218046121) 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, 27326 + ... + 34391.

It is an arithmetic number, because the mean of its divisors is an integer number (54527853).

Almost surely, 2^218046161 is an apocalyptic number.

It is an amenable number.

218046161 is a deficient number, since it is larger than the sum of its proper divisors (65251).

218046161 is an equidigital number, since it uses as much as digits as its factorization.

218046161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65250.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 218046161 is about 14766.3861862001. The cubic root of 218046161 is about 601.8886423310. Note that the first 3 decimals are identical.

Adding to 218046161 its reverse (161640812), we get a palindrome (379686973).

The spelling of 218046161 in words is "two hundred eighteen million, forty-six thousand, one hundred sixty-one".