276221161 has 2 divisors, whose sum is σ = 276221162. Its totient is φ = 276221160.

The previous prime is 276221159. The next prime is 276221167. The reversal of 276221161 is 161122672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158281561 + 117939600 = 12581^2 + 10860^2 .

It is a cyclic number.

It is not a de Polignac number, because 276221161 - 2¹ = 276221159 is a prime.

Together with 276221159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (276221167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138110580 + 138110581.

It is an arithmetic number, because the mean of its divisors is an integer number (138110581).

Almost surely, 2^276221161 is an apocalyptic number.

It is an amenable number.

276221161 is a deficient number, since it is larger than the sum of its proper divisors (1).

276221161 is an equidigital number, since it uses as much as digits as its factorization.

276221161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 276221161 is about 16619.9025568744. The cubic root of 276221161 is about 651.2568667237.

The spelling of 276221161 in words is "two hundred seventy-six million, two hundred twenty-one thousand, one hundred sixty-one".