249213 has 4 divisors (see below), whose sum is σ = 332288. Its totient is φ = 166140.

The previous prime is 249211. The next prime is 249217. The reversal of 249213 is 312942.

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 249213 - 2¹ = 249211 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 249213.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249213.

It is not an unprimeable number, because it can be changed into a prime (249211) 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, 41533 + ... + 41538.

It is an arithmetic number, because the mean of its divisors is an integer number (83072).

2²⁴⁹²¹³ is an apocalyptic number.

It is an amenable number.

249213 is a deficient number, since it is larger than the sum of its proper divisors (83075).

249213 is an equidigital number, since it uses as much as digits as its factorization.

249213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83074.

The product of its digits is 432, while the sum is 21.

The square root of 249213 is about 499.2123796542. The cubic root of 249213 is about 62.9298791504.

The spelling of 249213 in words is "two hundred forty-nine thousand, two hundred thirteen".