1280641049 has 2 divisors, whose sum is σ = 1280641050. Its totient is φ = 1280641048.

The previous prime is 1280641013. The next prime is 1280641099. The reversal of 1280641049 is 9401460821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1099254025 + 181387024 = 33155^2 + 13468^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280641049 - 2²⁰ = 1279592473 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280641099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640320524 + 640320525.

It is an arithmetic number, because the mean of its divisors is an integer number (640320525).

Almost surely, 2^1280641049 is an apocalyptic number.

It is an amenable number.

1280641049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280641049 is an equidigital number, since it uses as much as digits as its factorization.

1280641049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1280641049 is about 35786.0454507061. The cubic root of 1280641049 is about 1085.9482741683.

The spelling of 1280641049 in words is "one billion, two hundred eighty million, six hundred forty-one thousand, forty-nine".