245813 has 4 divisors (see below), whose sum is σ = 246828. Its totient is φ = 244800.

The previous prime is 245789. The next prime is 245821. The reversal of 245813 is 318542.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 117649 + 128164 = 343^2 + 358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245813 is a prime.

It is a d-powerful number, because it can be written as 2¹⁵ + 4 + 8⁵ + 5⁵ + 1 + 3¹¹ .

It is a Duffinian number.

It is a Curzon number.

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 245813.

It is not an unprimeable number, because it can be changed into a prime (245863) 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, 95 + ... + 707.

It is an arithmetic number, because the mean of its divisors is an integer number (61707).

2²⁴⁵⁸¹³ is an apocalyptic number.

It is an amenable number.

245813 is a deficient number, since it is larger than the sum of its proper divisors (1015).

245813 is an equidigital number, since it uses as much as digits as its factorization.

245813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014.

The product of its digits is 960, while the sum is 23.

The square root of 245813 is about 495.7953206717. The cubic root of 245813 is about 62.6423847125.

The spelling of 245813 in words is "two hundred forty-five thousand, eight hundred thirteen".