255538813 has 2 divisors, whose sum is σ = 255538814. Its totient is φ = 255538812.

The previous prime is 255538783. The next prime is 255538841. The reversal of 255538813 is 318835552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247024089 + 8514724 = 15717^2 + 2918^2 .

It is a cyclic number.

It is not a de Polignac number, because 255538813 - 2¹⁷ = 255407741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255538873) 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 as a sum of consecutive naturals, namely, 127769406 + 127769407.

It is an arithmetic number, because the mean of its divisors is an integer number (127769407).

Almost surely, 2^255538813 is an apocalyptic number.

It is an amenable number.

255538813 is a deficient number, since it is larger than the sum of its proper divisors (1).

255538813 is an equidigital number, since it uses as much as digits as its factorization.

255538813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144000, while the sum is 40.

The square root of 255538813 is about 15985.5814095078. The cubic root of 255538813 is about 634.5788953750.

The spelling of 255538813 in words is "two hundred fifty-five million, five hundred thirty-eight thousand, eight hundred thirteen".