275031221 has 2 divisors, whose sum is σ = 275031222. Its totient is φ = 275031220.

The previous prime is 275031191. The next prime is 275031233. The reversal of 275031221 is 122130572.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204890596 + 70140625 = 14314^2 + 8375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-275031221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (275031521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137515610 + 137515611.

It is an arithmetic number, because the mean of its divisors is an integer number (137515611).

Almost surely, 2^275031221 is an apocalyptic number.

It is an amenable number.

275031221 is a deficient number, since it is larger than the sum of its proper divisors (1).

275031221 is an equidigital number, since it uses as much as digits as its factorization.

275031221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 275031221 is about 16584.0652736294. The cubic root of 275031221 is about 650.3203320493.

Adding to 275031221 its reverse (122130572), we get a palindrome (397161793).

The spelling of 275031221 in words is "two hundred seventy-five million, thirty-one thousand, two hundred twenty-one".