220975681 has 12 divisors (see below), whose sum is σ = 235325412. Its totient is φ = 207454464.

The previous prime is 220975669. The next prime is 220975687. The reversal of 220975681 is 186579022.

It can be written as a sum of positive squares in 2 ways, for example, as 9709456 + 211266225 = 3116^2 + 14535^2 .

It is not a de Polignac number, because 220975681 - 2⁷ = 220975553 is a prime.

It is a super-2 number, since 2×220975681² = 97660503186827522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (220975687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38085 + ... + 43501.

It is an arithmetic number, because the mean of its divisors is an integer number (19610451).

Almost surely, 2^220975681 is an apocalyptic number.

It is an amenable number.

220975681 is a deficient number, since it is larger than the sum of its proper divisors (14349731).

220975681 is a wasteful number, since it uses less digits than its factorization.

220975681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5568 (or 5549 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 220975681 is about 14865.2507883318. The cubic root of 220975681 is about 604.5721821207.

The spelling of 220975681 in words is "two hundred twenty million, nine hundred seventy-five thousand, six hundred eighty-one".