655813 has 4 divisors (see below), whose sum is σ = 659340. Its totient is φ = 652288.

The previous prime is 655807. The next prime is 655847. The reversal of 655813 is 318556.

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 494209 + 161604 = 703^2 + 402^2 .

It is a cyclic number.

It is not a de Polignac number, because 655813 - 2⁹ = 655301 is a prime.

It is a Duffinian number.

655813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1468 + ... + 1861.

It is an arithmetic number, because the mean of its divisors is an integer number (164835).

2⁶⁵⁵⁸¹³ is an apocalyptic number.

It is an amenable number.

655813 is a deficient number, since it is larger than the sum of its proper divisors (3527).

655813 is a wasteful number, since it uses less digits than its factorization.

655813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3526.

The product of its digits is 3600, while the sum is 28.

The square root of 655813 is about 809.8228201280. The cubic root of 655813 is about 86.8813726499.

The spelling of 655813 in words is "six hundred fifty-five thousand, eight hundred thirteen".