275821213 has 2 divisors, whose sum is σ = 275821214. Its totient is φ = 275821212.

The previous prime is 275821187. The next prime is 275821219. The reversal of 275821213 is 312128572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275659609 + 161604 = 16603^2 + 402^2 .

It is a cyclic number.

It is not a de Polignac number, because 275821213 - 2⁵ = 275821181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (275821219) 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, 137910606 + 137910607.

It is an arithmetic number, because the mean of its divisors is an integer number (137910607).

Almost surely, 2^275821213 is an apocalyptic number.

It is an amenable number.

275821213 is a deficient number, since it is larger than the sum of its proper divisors (1).

275821213 is an equidigital number, since it uses as much as digits as its factorization.

275821213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 275821213 is about 16607.8659977735. The cubic root of 275821213 is about 650.9423908222.

Adding to 275821213 its reverse (312128572), we get a palindrome (587949785).

The spelling of 275821213 in words is "two hundred seventy-five million, eight hundred twenty-one thousand, two hundred thirteen".