280561500449 has 2 divisors, whose sum is σ = 280561500450. Its totient is φ = 280561500448.

The previous prime is 280561500431. The next prime is 280561500487. The reversal of 280561500449 is 944005165082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227319168400 + 53242332049 = 476780^2 + 230743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280561500449 is a prime.

It is not a weakly prime, because it can be changed into another prime (280561500409) 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 as a sum of consecutive naturals, namely, 140280750224 + 140280750225.

It is an arithmetic number, because the mean of its divisors is an integer number (140280750225).

Almost surely, 2^280561500449 is an apocalyptic number.

It is an amenable number.

280561500449 is a deficient number, since it is larger than the sum of its proper divisors (1).

280561500449 is an equidigital number, since it uses as much as digits as its factorization.

280561500449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 280561500449 in words is "two hundred eighty billion, five hundred sixty-one million, five hundred thousand, four hundred forty-nine".