276849409 has 2 divisors, whose sum is σ = 276849410. Its totient is φ = 276849408.

The previous prime is 276849407. The next prime is 276849421. The reversal of 276849409 is 904948672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252810000 + 24039409 = 15900^2 + 4903^2 .

It is a cyclic number.

It is not a de Polignac number, because 276849409 - 2¹ = 276849407 is a prime.

Together with 276849407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (276849407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138424704 + 138424705.

It is an arithmetic number, because the mean of its divisors is an integer number (138424705).

Almost surely, 2^276849409 is an apocalyptic number.

It is an amenable number.

276849409 is a deficient number, since it is larger than the sum of its proper divisors (1).

276849409 is an equidigital number, since it uses as much as digits as its factorization.

276849409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 276849409 is about 16638.7922939136. The cubic root of 276849409 is about 651.7502407261.

The spelling of 276849409 in words is "two hundred seventy-six million, eight hundred forty-nine thousand, four hundred nine".