276312821 has 2 divisors, whose sum is σ = 276312822. Its totient is φ = 276312820.

The previous prime is 276312761. The next prime is 276312857. The reversal of 276312821 is 128213672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261986596 + 14326225 = 16186^2 + 3785^2 .

It is a cyclic number.

It is not a de Polignac number, because 276312821 - 2¹⁴ = 276296437 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (276312121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138156410 + 138156411.

It is an arithmetic number, because the mean of its divisors is an integer number (138156411).

Almost surely, 2^276312821 is an apocalyptic number.

It is an amenable number.

276312821 is a deficient number, since it is larger than the sum of its proper divisors (1).

276312821 is an equidigital number, since it uses as much as digits as its factorization.

276312821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 32.

The square root of 276312821 is about 16622.6598653765. The cubic root of 276312821 is about 651.3288954832.

The spelling of 276312821 in words is "two hundred seventy-six million, three hundred twelve thousand, eight hundred twenty-one".