255520213 has 12 divisors (see below), whose sum is σ = 278174820. Its totient is φ = 233321472.

The previous prime is 255520211. The next prime is 255520219. The reversal of 255520213 is 312025552.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 223729 + 255296484 = 473^2 + 15978^2 .

It is not a de Polignac number, because 255520213 - 2¹ = 255520211 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 (255520211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121273 + ... + 123361.

It is an arithmetic number, because the mean of its divisors is an integer number (23181235).

Almost surely, 2^255520213 is an apocalyptic number.

It is an amenable number.

255520213 is a deficient number, since it is larger than the sum of its proper divisors (22654607).

255520213 is an equidigital number, since it uses as much as digits as its factorization.

255520213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296 (or 2199 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 255520213 is about 15984.9996246481. Note that the first 3 decimals coincide. The cubic root of 255520213 is about 634.5634985569.

Adding to 255520213 its reverse (312025552), we get a palindrome (567545765).

The spelling of 255520213 in words is "two hundred fifty-five million, five hundred twenty thousand, two hundred thirteen".