275221681 has 6 divisors (see below), whose sum is σ = 320155890. Its totient is φ = 235904256.

The previous prime is 275221679. The next prime is 275221711. The reversal of 275221681 is 186122572.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 163200625 + 112021056 = 12775^2 + 10584^2 .

It is not a de Polignac number, because 275221681 - 2¹ = 275221679 is a prime.

It is a super-2 number, since 2×275221681² = 151493947384931522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (275221601) 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 5 ways as a sum of consecutive naturals, for example, 2808336 + ... + 2808433.

It is an arithmetic number, because the mean of its divisors is an integer number (53359315).

Almost surely, 2^275221681 is an apocalyptic number.

It is an amenable number.

275221681 is a deficient number, since it is larger than the sum of its proper divisors (44934209).

275221681 is an equidigital number, since it uses as much as digits as its factorization.

275221681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5616783 (or 5616776 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 275221681 is about 16589.8065389564. The cubic root of 275221681 is about 650.4704137138.

The spelling of 275221681 in words is "two hundred seventy-five million, two hundred twenty-one thousand, six hundred eighty-one".