249313 has 4 divisors (see below), whose sum is σ = 257940. Its totient is φ = 240688.

The previous prime is 249311. The next prime is 249317. The reversal of 249313 is 313942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313942 = 2 ⋅156971.

It can be written as a sum of positive squares in 2 ways, for example, as 154449 + 94864 = 393^2 + 308^2 .

It is a cyclic number.

It is not a de Polignac number, because 249313 - 2¹ = 249311 is a prime.

It is a Duffinian number.

249313 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (249311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4270 + ... + 4327.

It is an arithmetic number, because the mean of its divisors is an integer number (64485).

2²⁴⁹³¹³ is an apocalyptic number.

It is an amenable number.

249313 is a deficient number, since it is larger than the sum of its proper divisors (8627).

249313 is an equidigital number, since it uses as much as digits as its factorization.

249313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8626.

The product of its digits is 648, while the sum is 22.

The square root of 249313 is about 499.3125273814. The cubic root of 249313 is about 62.9382951726.

The spelling of 249313 in words is "two hundred forty-nine thousand, three hundred thirteen".