255653813 has 2 divisors, whose sum is σ = 255653814. Its totient is φ = 255653812.

The previous prime is 255653777. The next prime is 255653833. The reversal of 255653813 is 318356552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172607044 + 83046769 = 13138^2 + 9113^2 .

It is a cyclic number.

It is not a de Polignac number, because 255653813 - 2⁸ = 255653557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255653833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127826906 + 127826907.

It is an arithmetic number, because the mean of its divisors is an integer number (127826907).

Almost surely, 2^255653813 is an apocalyptic number.

It is an amenable number.

255653813 is a deficient number, since it is larger than the sum of its proper divisors (1).

255653813 is an equidigital number, since it uses as much as digits as its factorization.

255653813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108000, while the sum is 38.

The square root of 255653813 is about 15989.1779963824. The cubic root of 255653813 is about 634.6740741695.

The spelling of 255653813 in words is "two hundred fifty-five million, six hundred fifty-three thousand, eight hundred thirteen".