276732721 has 2 divisors, whose sum is σ = 276732722. Its totient is φ = 276732720.

The previous prime is 276732719. The next prime is 276732751. The reversal of 276732721 is 127237672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264517696 + 12215025 = 16264^2 + 3495^2 .

It is a cyclic number.

It is not a de Polignac number, because 276732721 - 2¹ = 276732719 is a prime.

Together with 276732719, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (276732751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138366360 + 138366361.

It is an arithmetic number, because the mean of its divisors is an integer number (138366361).

Almost surely, 2^276732721 is an apocalyptic number.

It is an amenable number.

276732721 is a deficient number, since it is larger than the sum of its proper divisors (1).

276732721 is an equidigital number, since it uses as much as digits as its factorization.

276732721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 37.

The square root of 276732721 is about 16635.2854198538. The cubic root of 276732721 is about 651.6586601087.

The spelling of 276732721 in words is "two hundred seventy-six million, seven hundred thirty-two thousand, seven hundred twenty-one".