249997 has 4 divisors (see below), whose sum is σ = 272736. Its totient is φ = 227260.

The previous prime is 249989. The next prime is 250007. The reversal of 249997 is 799942.

249997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 249997 - 2³ = 249989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11353 + ... + 11374.

It is an arithmetic number, because the mean of its divisors is an integer number (68184).

2²⁴⁹⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

249997 is a deficient number, since it is larger than the sum of its proper divisors (22739).

249997 is a wasteful number, since it uses less digits than its factorization.

249997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22738.

The product of its digits is 40824, while the sum is 40.

The square root of 249997 is about 499.9969999910. The cubic root of 249997 is about 62.9958005095.

Subtracting 249997 from its reverse (799942), we obtain a palindrome (549945).

The spelling of 249997 in words is "two hundred forty-nine thousand, nine hundred ninety-seven".