1280349457 has 2 divisors, whose sum is σ = 1280349458. Its totient is φ = 1280349456.

The previous prime is 1280349439. The next prime is 1280349491. The reversal of 1280349457 is 7549430821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1217242321 + 63107136 = 34889^2 + 7944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280349457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280349437) 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, 640174728 + 640174729.

It is an arithmetic number, because the mean of its divisors is an integer number (640174729).

Almost surely, 2^1280349457 is an apocalyptic number.

It is an amenable number.

1280349457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280349457 is an equidigital number, since it uses as much as digits as its factorization.

1280349457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 1280349457 is about 35781.9711167510. The cubic root of 1280349457 is about 1085.8658472552.

The spelling of 1280349457 in words is "one billion, two hundred eighty million, three hundred forty-nine thousand, four hundred fifty-seven".