1280494673 has 2 divisors, whose sum is σ = 1280494674. Its totient is φ = 1280494672.

The previous prime is 1280494639. The next prime is 1280494693. The reversal of 1280494673 is 3764940821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1278205504 + 2289169 = 35752^2 + 1513^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280494673 - 2⁶ = 1280494609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280494603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640247336 + 640247337.

It is an arithmetic number, because the mean of its divisors is an integer number (640247337).

Almost surely, 2^1280494673 is an apocalyptic number.

It is an amenable number.

1280494673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280494673 is an equidigital number, since it uses as much as digits as its factorization.

1280494673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 1280494673 is about 35784.0002375363. Note that the first 3 decimals coincide. The cubic root of 1280494673 is about 1085.9068983222.

The spelling of 1280494673 in words is "one billion, two hundred eighty million, four hundred ninety-four thousand, six hundred seventy-three".