218156041 has 4 divisors (see below), whose sum is σ = 218967300. Its totient is φ = 217344784.

The previous prime is 218156011. The next prime is 218156063. The reversal of 218156041 is 140651812.

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 28515600 + 189640441 = 5340^2 + 13771^2 .

It is a cyclic number.

It is not a de Polignac number, because 218156041 - 2²³ = 209767433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218156011) 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, 405226 + ... + 405763.

It is an arithmetic number, because the mean of its divisors is an integer number (54741825).

Almost surely, 2^218156041 is an apocalyptic number.

It is an amenable number.

218156041 is a deficient number, since it is larger than the sum of its proper divisors (811259).

218156041 is an equidigital number, since it uses as much as digits as its factorization.

218156041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811258.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 218156041 is about 14770.1063300167. The cubic root of 218156041 is about 601.9897285989.

The spelling of 218156041 in words is "two hundred eighteen million, one hundred fifty-six thousand, forty-one".