255530813 has 2 divisors, whose sum is σ = 255530814. Its totient is φ = 255530812.

The previous prime is 255530809. The next prime is 255530857. The reversal of 255530813 is 318035552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169078009 + 86452804 = 13003^2 + 9298^2 .

It is a cyclic number.

It is not a de Polignac number, because 255530813 - 2² = 255530809 is a prime.

It is a super-3 number, since 3×255530813³ (a number of 26 digits) contains 333 as substring.

It is equal to p_13965233 and since 255530813 and 13965233 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255530813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255530113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127765406 + 127765407.

It is an arithmetic number, because the mean of its divisors is an integer number (127765407).

Almost surely, 2^255530813 is an apocalyptic number.

It is an amenable number.

255530813 is a deficient number, since it is larger than the sum of its proper divisors (1).

255530813 is an equidigital number, since it uses as much as digits as its factorization.

255530813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 255530813 is about 15985.3311820556. The cubic root of 255530813 is about 634.5722731792.

The spelling of 255530813 in words is "two hundred fifty-five million, five hundred thirty thousand, eight hundred thirteen".