255006821 has 2 divisors, whose sum is σ = 255006822. Its totient is φ = 255006820.

The previous prime is 255006811. The next prime is 255006833. The reversal of 255006821 is 128600552.

255006821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172396900 + 82609921 = 13130^2 + 9089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255006821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255006811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127503410 + 127503411.

It is an arithmetic number, because the mean of its divisors is an integer number (127503411).

Almost surely, 2^255006821 is an apocalyptic number.

It is an amenable number.

255006821 is a deficient number, since it is larger than the sum of its proper divisors (1).

255006821 is an equidigital number, since it uses as much as digits as its factorization.

255006821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 255006821 is about 15968.9329950376. The cubic root of 255006821 is about 634.1382246296.

The spelling of 255006821 in words is "two hundred fifty-five million, six thousand, eight hundred twenty-one".