249771 has 4 divisors (see below), whose sum is σ = 333032. Its totient is φ = 166512.

The previous prime is 249763. The next prime is 249779. The reversal of 249771 is 177942.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (249763) and next prime (249779).

It is not a de Polignac number, because 249771 - 2³ = 249763 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249771.

It is not an unprimeable number, because it can be changed into a prime (249779) 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 in 3 ways as a sum of consecutive naturals, for example, 41626 + ... + 41631.

It is an arithmetic number, because the mean of its divisors is an integer number (83258).

2²⁴⁹⁷⁷¹ is an apocalyptic number.

249771 is a deficient number, since it is larger than the sum of its proper divisors (83261).

249771 is an equidigital number, since it uses as much as digits as its factorization.

249771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83260.

The product of its digits is 3528, while the sum is 30.

The square root of 249771 is about 499.7709475350. The cubic root of 249771 is about 62.9768118240.

The spelling of 249771 in words is "two hundred forty-nine thousand, seven hundred seventy-one".