255218813 has 4 divisors (see below), whose sum is σ = 257560380. Its totient is φ = 252877248.

The previous prime is 255218771. The next prime is 255218827. The reversal of 255218813 is 318812552.

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 96786244 + 158432569 = 9838^2 + 12587^2 .

It is a cyclic number.

It is not a de Polignac number, because 255218813 - 2¹² = 255214717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255218113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1170620 + ... + 1170837.

It is an arithmetic number, because the mean of its divisors is an integer number (64390095).

Almost surely, 2^255218813 is an apocalyptic number.

It is an amenable number.

255218813 is a deficient number, since it is larger than the sum of its proper divisors (2341567).

255218813 is a wasteful number, since it uses less digits than its factorization.

255218813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341566.

The product of its digits is 19200, while the sum is 35.

The square root of 255218813 is about 15975.5692543333. The cubic root of 255218813 is about 634.3138996634.

The spelling of 255218813 in words is "two hundred fifty-five million, two hundred eighteen thousand, eight hundred thirteen".