255554821 has 2 divisors, whose sum is σ = 255554822. Its totient is φ = 255554820.

The previous prime is 255554801. The next prime is 255554833. The reversal of 255554821 is 128455552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255520225 + 34596 = 15985^2 + 186^2 .

It is a cyclic number.

It is not a de Polignac number, because 255554821 - 2⁹ = 255554309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255554801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127777410 + 127777411.

It is an arithmetic number, because the mean of its divisors is an integer number (127777411).

Almost surely, 2^255554821 is an apocalyptic number.

It is an amenable number.

255554821 is a deficient number, since it is larger than the sum of its proper divisors (1).

255554821 is an equidigital number, since it uses as much as digits as its factorization.

255554821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80000, while the sum is 37.

The square root of 255554821 is about 15986.0821028794. The cubic root of 255554821 is about 634.5921459738.

The spelling of 255554821 in words is "two hundred fifty-five million, five hundred fifty-four thousand, eight hundred twenty-one".