249009 has 4 divisors (see below), whose sum is σ = 332016. Its totient is φ = 166004.

The previous prime is 248987. The next prime is 249017. The reversal of 249009 is 900942.

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 a cyclic number.

It is not a de Polignac number, because 249009 - 2⁸ = 248753 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 249009.

It is not an unprimeable number, because it can be changed into a prime (249059) 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, 41499 + ... + 41504.

It is an arithmetic number, because the mean of its divisors is an integer number (83004).

2²⁴⁹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

249009 is a deficient number, since it is larger than the sum of its proper divisors (83007).

249009 is an equidigital number, since it uses as much as digits as its factorization.

249009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83006.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 249009 is about 499.0080159677. The cubic root of 249009 is about 62.9127034817.

The spelling of 249009 in words is "two hundred forty-nine thousand, nine".