1280886109 has 2 divisors, whose sum is σ = 1280886110. Its totient is φ = 1280886108.

The previous prime is 1280886073. The next prime is 1280886119. The reversal of 1280886109 is 9016880821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1063412100 + 217474009 = 32610^2 + 14747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280886109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280886119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640443054 + 640443055.

It is an arithmetic number, because the mean of its divisors is an integer number (640443055).

Almost surely, 2^1280886109 is an apocalyptic number.

It is an amenable number.

1280886109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280886109 is an equidigital number, since it uses as much as digits as its factorization.

1280886109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 43.

The square root of 1280886109 is about 35789.4692472520. The cubic root of 1280886109 is about 1086.0175377899.

The spelling of 1280886109 in words is "one billion, two hundred eighty million, eight hundred eighty-six thousand, one hundred nine".