275664209 has 2 divisors, whose sum is σ = 275664210. Its totient is φ = 275664208.

The previous prime is 275664187. The next prime is 275664229. The reversal of 275664209 is 902466572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204633025 + 71031184 = 14305^2 + 8428^2 .

It is a cyclic number.

It is not a de Polignac number, because 275664209 - 2⁸ = 275663953 is a prime.

It is a super-2 number, since 2×275664209² = 151981512247191362, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (275664229) 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 as a sum of consecutive naturals, namely, 137832104 + 137832105.

It is an arithmetic number, because the mean of its divisors is an integer number (137832105).

Almost surely, 2^275664209 is an apocalyptic number.

It is an amenable number.

275664209 is a deficient number, since it is larger than the sum of its proper divisors (1).

275664209 is an equidigital number, since it uses as much as digits as its factorization.

275664209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 275664209 is about 16603.1385286036. The cubic root of 275664209 is about 650.8188567452.

The spelling of 275664209 in words is "two hundred seventy-five million, six hundred sixty-four thousand, two hundred nine".