249680287 has 2 divisors, whose sum is σ = 249680288. Its totient is φ = 249680286.

The previous prime is 249680239. The next prime is 249680323. The reversal of 249680287 is 782086942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249680287 - 2¹⁹ = 249155999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249680687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124840143 + 124840144.

It is an arithmetic number, because the mean of its divisors is an integer number (124840144).

Almost surely, 2^249680287 is an apocalyptic number.

249680287 is a deficient number, since it is larger than the sum of its proper divisors (1).

249680287 is an equidigital number, since it uses as much as digits as its factorization.

249680287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 249680287 is about 15801.2748536313. The cubic root of 249680287 is about 629.6918682984.

The spelling of 249680287 in words is "two hundred forty-nine million, six hundred eighty thousand, two hundred eighty-seven".