280561113 has 18 divisors (see below), whose sum is σ = 471419754. Its totient is φ = 160320384.

The previous prime is 280561079. The next prime is 280561117. The reversal of 280561113 is 311165082.

It can be written as a sum of positive squares in only one way, i.e., 270372249 + 10188864 = 16443^2 + 3192^2 .

It is not a de Polignac number, because 280561113 - 2¹⁸ = 280298969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280561117) 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 in 17 ways as a sum of consecutive naturals, for example, 317656 + ... + 318537.

Almost surely, 2^280561113 is an apocalyptic number.

It is an amenable number.

280561113 is a deficient number, since it is larger than the sum of its proper divisors (190858641).

280561113 is a wasteful number, since it uses less digits than its factorization.

280561113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636213 (or 636203 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 280561113 is about 16749.9585969638. The cubic root of 280561113 is about 654.6499794512.

The spelling of 280561113 in words is "two hundred eighty million, five hundred sixty-one thousand, one hundred thirteen".