218971853 has 2 divisors, whose sum is σ = 218971854. Its totient is φ = 218971852.

The previous prime is 218971847. The next prime is 218971859. The reversal of 218971853 is 358179812.

It is a balanced prime because it is at equal distance from previous prime (218971847) and next prime (218971859).

It can be written as a sum of positive squares in only one way, i.e., 205148329 + 13823524 = 14323^2 + 3718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218971853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218971859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109485926 + 109485927.

It is an arithmetic number, because the mean of its divisors is an integer number (109485927).

Almost surely, 2^218971853 is an apocalyptic number.

It is an amenable number.

218971853 is a deficient number, since it is larger than the sum of its proper divisors (1).

218971853 is an equidigital number, since it uses as much as digits as its factorization.

218971853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The square root of 218971853 is about 14797.6975573905. The cubic root of 218971853 is about 602.7391914277.

The spelling of 218971853 in words is "two hundred eighteen million, nine hundred seventy-one thousand, eight hundred fifty-three".