280566493 has 2 divisors, whose sum is σ = 280566494. Its totient is φ = 280566492.

The previous prime is 280566469. The next prime is 280566563. The reversal of 280566493 is 394665082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278322489 + 2244004 = 16683^2 + 1498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280566493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280566413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140283246 + 140283247.

It is an arithmetic number, because the mean of its divisors is an integer number (140283247).

Almost surely, 2^280566493 is an apocalyptic number.

It is an amenable number.

280566493 is a deficient number, since it is larger than the sum of its proper divisors (1).

280566493 is an equidigital number, since it uses as much as digits as its factorization.

280566493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 280566493 is about 16750.1191936058. The cubic root of 280566493 is about 654.6541639161.

The spelling of 280566493 in words is "two hundred eighty million, five hundred sixty-six thousand, four hundred ninety-three".