280249 has 2 divisors, whose sum is σ = 280250. Its totient is φ = 280248.

The previous prime is 280243. The next prime is 280253. The reversal of 280249 is 942082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275625 + 4624 = 525^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 280249 - 2⁷ = 280121 is a prime.

280249 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (280243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140124 + 140125.

It is an arithmetic number, because the mean of its divisors is an integer number (140125).

2²⁸⁰²⁴⁹ is an apocalyptic number.

It is an amenable number.

280249 is a deficient number, since it is larger than the sum of its proper divisors (1).

280249 is an equidigital number, since it uses as much as digits as its factorization.

280249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 280249 is about 529.3854928122. The cubic root of 280249 is about 65.4407132083.

It can be divided in two parts, 280 and 249, that added together give a square (529 = 23²).

The spelling of 280249 in words is "two hundred eighty thousand, two hundred forty-nine".