249797 has 2 divisors, whose sum is σ = 249798. Its totient is φ = 249796.

The previous prime is 249779. The next prime is 249811. The reversal of 249797 is 797942.

It is a happy number.

Together with previous prime (249779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206116 + 43681 = 454^2 + 209^2 .

It is a cyclic number.

It is not a de Polignac number, because 249797 - 2⁸ = 249541 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249797.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249797.

It is not a weakly prime, because it can be changed into another prime (249727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124898 + 124899.

It is an arithmetic number, because the mean of its divisors is an integer number (124899).

2²⁴⁹⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

249797 is a deficient number, since it is larger than the sum of its proper divisors (1).

249797 is an equidigital number, since it uses as much as digits as its factorization.

249797 is an evil number, because the sum of its binary digits is even.

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

The square root of 249797 is about 499.7969587743. The cubic root of 249797 is about 62.9789969460.

The spelling of 249797 in words is "two hundred forty-nine thousand, seven hundred ninety-seven".