280681109 has 2 divisors, whose sum is σ = 280681110. Its totient is φ = 280681108.

The previous prime is 280681103. The next prime is 280681117. The reversal of 280681109 is 901186082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141086884 + 139594225 = 11878^2 + 11815^2 .

It is a cyclic number.

It is not a de Polignac number, because 280681109 - 2²⁰ = 279632533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280681103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140340554 + 140340555.

It is an arithmetic number, because the mean of its divisors is an integer number (140340555).

Almost surely, 2^280681109 is an apocalyptic number.

It is an amenable number.

280681109 is a deficient number, since it is larger than the sum of its proper divisors (1).

280681109 is an equidigital number, since it uses as much as digits as its factorization.

280681109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 280681109 is about 16753.5401930458. The cubic root of 280681109 is about 654.7432974231.

The spelling of 280681109 in words is "two hundred eighty million, six hundred eighty-one thousand, one hundred nine".