276216991 has 2 divisors, whose sum is σ = 276216992. Its totient is φ = 276216990.

The previous prime is 276216977. The next prime is 276217013. The reversal of 276216991 is 199612672.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 276216991 - 2¹¹ = 276214943 is a prime.

It is a super-2 number, since 2×276216991² = 152591652234188162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (276216911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138108495 + 138108496.

It is an arithmetic number, because the mean of its divisors is an integer number (138108496).

Almost surely, 2^276216991 is an apocalyptic number.

276216991 is a deficient number, since it is larger than the sum of its proper divisors (1).

276216991 is an equidigital number, since it uses as much as digits as its factorization.

276216991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 276216991 is about 16619.7771044019. Note that the first 3 decimals coincide. The cubic root of 276216991 is about 651.2535894527.

The spelling of 276216991 in words is "two hundred seventy-six million, two hundred sixteen thousand, nine hundred ninety-one".