249609 has 4 divisors (see below), whose sum is σ = 332816. Its totient is φ = 166404.

The previous prime is 249607. The next prime is 249647. The reversal of 249609 is 906942.

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 249609 - 2¹ = 249607 is a prime.

It is a D-number.

It is a Duffinian number.

249609 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249609.

It is not an unprimeable number, because it can be changed into a prime (249607) 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, 41599 + ... + 41604.

It is an arithmetic number, because the mean of its divisors is an integer number (83204).

2²⁴⁹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

249609 is a deficient number, since it is larger than the sum of its proper divisors (83207).

249609 is an equidigital number, since it uses as much as digits as its factorization.

249609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83206.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 249609 is about 499.6088469993. The cubic root of 249609 is about 62.9631934162.

It can be divided in two parts, 249 and 609, that added together give a palindrome (858).

The spelling of 249609 in words is "two hundred forty-nine thousand, six hundred nine".