280243969 has 2 divisors, whose sum is σ = 280243970. Its totient is φ = 280243968.

The previous prime is 280243933. The next prime is 280243987. The reversal of 280243969 is 969342082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 277722225 + 2521744 = 16665^2 + 1588^2 .

It is a cyclic number.

It is not a de Polignac number, because 280243969 - 2⁷ = 280243841 is a prime.

It is a super-2 number, since 2×280243969² = 157073364321745922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (280243919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140121984 + 140121985.

It is an arithmetic number, because the mean of its divisors is an integer number (140121985).

Almost surely, 2^280243969 is an apocalyptic number.

It is an amenable number.

280243969 is a deficient number, since it is larger than the sum of its proper divisors (1).

280243969 is an equidigital number, since it uses as much as digits as its factorization.

280243969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 280243969 is about 16740.4889116178. The cubic root of 280243969 is about 654.4032161108.

The spelling of 280243969 in words is "two hundred eighty million, two hundred forty-three thousand, nine hundred sixty-nine".