276868721 has 2 divisors, whose sum is σ = 276868722. Its totient is φ = 276868720.

The previous prime is 276868667. The next prime is 276868747. The reversal of 276868721 is 127868672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 276756496 + 112225 = 16636^2 + 335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-276868721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (276868021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138434360 + 138434361.

It is an arithmetic number, because the mean of its divisors is an integer number (138434361).

Almost surely, 2^276868721 is an apocalyptic number.

It is an amenable number.

276868721 is a deficient number, since it is larger than the sum of its proper divisors (1).

276868721 is an equidigital number, since it uses as much as digits as its factorization.

276868721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 47.

The square root of 276868721 is about 16639.3726143746. The cubic root of 276868721 is about 651.7653949430.

The spelling of 276868721 in words is "two hundred seventy-six million, eight hundred sixty-eight thousand, seven hundred twenty-one".