275055721 has 2 divisors, whose sum is σ = 275055722. Its totient is φ = 275055720.

The previous prime is 275055707. The next prime is 275055769. The reversal of 275055721 is 127550572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175854121 + 99201600 = 13261^2 + 9960^2 .

It is a cyclic number.

It is not a de Polignac number, because 275055721 - 2¹¹ = 275053673 is a prime.

It is not a weakly prime, because it can be changed into another prime (275095721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137527860 + 137527861.

It is an arithmetic number, because the mean of its divisors is an integer number (137527861).

Almost surely, 2^275055721 is an apocalyptic number.

It is an amenable number.

275055721 is a deficient number, since it is larger than the sum of its proper divisors (1).

275055721 is an equidigital number, since it uses as much as digits as its factorization.

275055721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24500, while the sum is 34.

The square root of 275055721 is about 16584.8039180450. The cubic root of 275055721 is about 650.3396418268.

The spelling of 275055721 in words is "two hundred seventy-five million, fifty-five thousand, seven hundred twenty-one".