249973 has 2 divisors, whose sum is σ = 249974. Its totient is φ = 249972.

The previous prime is 249971. The next prime is 249989. The reversal of 249973 is 379942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223729 + 26244 = 473^2 + 162^2 .

It is a cyclic number.

It is not a de Polignac number, because 249973 - 2¹ = 249971 is a prime.

Together with 249971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124986 + 124987.

It is an arithmetic number, because the mean of its divisors is an integer number (124987).

249973 is a Friedman number, since it can be written as (9*(9-2))^3-74, using all its digits and the basic arithmetic operations.

2²⁴⁹⁹⁷³ is an apocalyptic number.

It is an amenable number.

249973 is a deficient number, since it is larger than the sum of its proper divisors (1).

249973 is an equidigital number, since it uses as much as digits as its factorization.

249973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 34.

The square root of 249973 is about 499.9729992710. The cubic root of 249973 is about 62.9937845552.

The spelling of 249973 in words is "two hundred forty-nine thousand, nine hundred seventy-three".