813245 has 4 divisors (see below), whose sum is σ = 975900. Its totient is φ = 650592.

The previous prime is 813227. The next prime is 813251. The reversal of 813245 is 542318.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 326041 + 487204 = 571^2 + 698^2 .

It is a cyclic number.

It is not a de Polignac number, because 813245 - 2¹⁰ = 812221 is a prime.

It is a super-2 number, since 2×813245² = 1322734860050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 813245.

It is a congruent number.

It is an unprimeable number.

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, 81320 + ... + 81329.

It is an arithmetic number, because the mean of its divisors is an integer number (243975).

2⁸¹³²⁴⁵ is an apocalyptic number.

It is an amenable number.

813245 is a deficient number, since it is larger than the sum of its proper divisors (162655).

813245 is a wasteful number, since it uses less digits than its factorization.

813245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162654.

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

The square root of 813245 is about 901.8009758256. The cubic root of 813245 is about 93.3412904214.

It can be divided in two parts, 8132 and 45, that multiplied together give a triangular number (365940 = T₈₅₅).

The spelling of 813245 in words is "eight hundred thirteen thousand, two hundred forty-five".