249779 has 2 divisors, whose sum is σ = 249780. Its totient is φ = 249778.

The previous prime is 249763. The next prime is 249797. The reversal of 249779 is 977942.

It is a happy number.

Together with next prime (249797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249779 - 2⁴ = 249763 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (249749) 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, 124889 + 124890.

It is an arithmetic number, because the mean of its divisors is an integer number (124890).

2²⁴⁹⁷⁷⁹ is an apocalyptic number.

249779 is a deficient number, since it is larger than the sum of its proper divisors (1).

249779 is an equidigital number, since it uses as much as digits as its factorization.

249779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 249779 is about 499.7789511374. The cubic root of 249779 is about 62.9774841854.

The spelling of 249779 in words is "two hundred forty-nine thousand, seven hundred seventy-nine".