821277449 has 2 divisors, whose sum is σ = 821277450. Its totient is φ = 821277448.

The previous prime is 821277409. The next prime is 821277467. The reversal of 821277449 is 944772128.

821277449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 486643600 + 334633849 = 22060^2 + 18293^2 .

It is a cyclic number.

It is not a de Polignac number, because 821277449 - 2¹² = 821273353 is a prime.

It is not a weakly prime, because it can be changed into another prime (821277409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410638724 + 410638725.

It is an arithmetic number, because the mean of its divisors is an integer number (410638725).

Almost surely, 2^821277449 is an apocalyptic number.

It is an amenable number.

821277449 is a deficient number, since it is larger than the sum of its proper divisors (1).

821277449 is an equidigital number, since it uses as much as digits as its factorization.

821277449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 44.

The square root of 821277449 is about 28657.9386732542. The cubic root of 821277449 is about 936.4759587903.

The spelling of 821277449 in words is "eight hundred twenty-one million, two hundred seventy-seven thousand, four hundred forty-nine".