1280204899 has 2 divisors, whose sum is σ = 1280204900. Its totient is φ = 1280204898.

The previous prime is 1280204897. The next prime is 1280204927. The reversal of 1280204899 is 9984020821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1280204899 - 2¹ = 1280204897 is a prime.

Together with 1280204897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1280204897) 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, 640102449 + 640102450.

It is an arithmetic number, because the mean of its divisors is an integer number (640102450).

Almost surely, 2^1280204899 is an apocalyptic number.

1280204899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280204899 is an equidigital number, since it uses as much as digits as its factorization.

1280204899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 1280204899 is about 35779.9510759867. The cubic root of 1280204899 is about 1085.8249791151.

The spelling of 1280204899 in words is "one billion, two hundred eighty million, two hundred four thousand, eight hundred ninety-nine".