249871 has 2 divisors, whose sum is σ = 249872. Its totient is φ = 249870.

The previous prime is 249863. The next prime is 249881. The reversal of 249871 is 178942.

249871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249871 - 2³ = 249863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124935 + 124936.

It is an arithmetic number, because the mean of its divisors is an integer number (124936).

2²⁴⁹⁸⁷¹ is an apocalyptic number.

249871 is a deficient number, since it is larger than the sum of its proper divisors (1).

249871 is an equidigital number, since it uses as much as digits as its factorization.

249871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 249871 is about 499.8709833547. The cubic root of 249871 is about 62.9852153095.

The spelling of 249871 in words is "two hundred forty-nine thousand, eight hundred seventy-one".