255755813 has 2 divisors, whose sum is σ = 255755814. Its totient is φ = 255755812.

The previous prime is 255755779. The next prime is 255755821. The reversal of 255755813 is 318557552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158180929 + 97574884 = 12577^2 + 9878^2 .

It is a cyclic number.

It is not a de Polignac number, because 255755813 - 2⁶ = 255755749 is a prime.

It is a super-2 number, since 2×255755813² = 130822071766581938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255755833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127877906 + 127877907.

It is an arithmetic number, because the mean of its divisors is an integer number (127877907).

Almost surely, 2^255755813 is an apocalyptic number.

It is an amenable number.

255755813 is a deficient number, since it is larger than the sum of its proper divisors (1).

255755813 is an equidigital number, since it uses as much as digits as its factorization.

255755813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 210000, while the sum is 41.

The square root of 255755813 is about 15992.3673357011. The cubic root of 255755813 is about 634.7584697397.

The spelling of 255755813 in words is "two hundred fifty-five million, seven hundred fifty-five thousand, eight hundred thirteen".