1280678099 has 4 divisors (see below), whose sum is σ = 1293881064. Its totient is φ = 1267475136.

The previous prime is 1280678093. The next prime is 1280678129. The reversal of 1280678099 is 9908760821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1280678099 - 2⁴ = 1280678083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280678093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6601337 + ... + 6601530.

It is an arithmetic number, because the mean of its divisors is an integer number (323470266).

Almost surely, 2^1280678099 is an apocalyptic number.

1280678099 is a deficient number, since it is larger than the sum of its proper divisors (13202965).

1280678099 is an equidigital number, since it uses as much as digits as its factorization.

1280678099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13202964.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 1280678099 is about 35786.5631068422. The cubic root of 1280678099 is about 1085.9587465266.

The spelling of 1280678099 in words is "one billion, two hundred eighty million, six hundred seventy-eight thousand, ninety-nine".