218523941 has 2 divisors, whose sum is σ = 218523942. Its totient is φ = 218523940.

The previous prime is 218523931. The next prime is 218523971. The reversal of 218523941 is 149325812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186431716 + 32092225 = 13654^2 + 5665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218523941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218523901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109261970 + 109261971.

It is an arithmetic number, because the mean of its divisors is an integer number (109261971).

Almost surely, 2^218523941 is an apocalyptic number.

It is an amenable number.

218523941 is a deficient number, since it is larger than the sum of its proper divisors (1).

218523941 is an equidigital number, since it uses as much as digits as its factorization.

218523941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 218523941 is about 14782.5552933179. Note that the first 3 decimals coincide. The cubic root of 218523941 is about 602.3279385629.

The spelling of 218523941 in words is "two hundred eighteen million, five hundred twenty-three thousand, nine hundred forty-one".