280560649 has 2 divisors, whose sum is σ = 280560650. Its totient is φ = 280560648.

The previous prime is 280560629. The next prime is 280560671. The reversal of 280560649 is 946065082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278656249 + 1904400 = 16693^2 + 1380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280560649 is a prime.

It is not a weakly prime, because it can be changed into another prime (280560619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140280324 + 140280325.

It is an arithmetic number, because the mean of its divisors is an integer number (140280325).

Almost surely, 2^280560649 is an apocalyptic number.

It is an amenable number.

280560649 is a deficient number, since it is larger than the sum of its proper divisors (1).

280560649 is an equidigital number, since it uses as much as digits as its factorization.

280560649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 280560649 is about 16749.9447461775. The cubic root of 280560649 is about 654.6496185580.

The spelling of 280560649 in words is "two hundred eighty million, five hundred sixty thousand, six hundred forty-nine".