249215 has 4 divisors (see below), whose sum is σ = 299064. Its totient is φ = 199368.

The previous prime is 249211. The next prime is 249217. The reversal of 249215 is 512942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 512942 = 2 ⋅256471.

It is a cyclic number.

It is not a de Polignac number, because 249215 - 2² = 249211 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249211) 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, 24917 + ... + 24926.

It is an arithmetic number, because the mean of its divisors is an integer number (74766).

2²⁴⁹²¹⁵ is an apocalyptic number.

249215 is a deficient number, since it is larger than the sum of its proper divisors (49849).

249215 is an equidigital number, since it uses as much as digits as its factorization.

249215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49848.

The product of its digits is 720, while the sum is 23.

The square root of 249215 is about 499.2143828056. The cubic root of 249215 is about 62.9300474929.

It can be divided in two parts, 249 and 215, that multiplied together give a palindrome (53535).

The spelling of 249215 in words is "two hundred forty-nine thousand, two hundred fifteen".