220118681 has 2 divisors, whose sum is σ = 220118682. Its totient is φ = 220118680.

The previous prime is 220118659. The next prime is 220118687. The reversal of 220118681 is 186811022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212693056 + 7425625 = 14584^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 220118681 - 2²⁶ = 153009817 is a prime.

It is a super-2 number, since 2×220118681² = 96904467450359522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220118687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110059340 + 110059341.

It is an arithmetic number, because the mean of its divisors is an integer number (110059341).

Almost surely, 2^220118681 is an apocalyptic number.

It is an amenable number.

220118681 is a deficient number, since it is larger than the sum of its proper divisors (1).

220118681 is an equidigital number, since it uses as much as digits as its factorization.

220118681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 220118681 is about 14836.3971704724. The cubic root of 220118681 is about 603.7896079133.

The spelling of 220118681 in words is "two hundred twenty million, one hundred eighteen thousand, six hundred eighty-one".