255404417 has 2 divisors, whose sum is σ = 255404418. Its totient is φ = 255404416.

The previous prime is 255404389. The next prime is 255404423. The reversal of 255404417 is 714404552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247086961 + 8317456 = 15719^2 + 2884^2 .

It is a cyclic number.

It is not a de Polignac number, because 255404417 - 2¹⁴ = 255388033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255404437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127702208 + 127702209.

It is an arithmetic number, because the mean of its divisors is an integer number (127702209).

Almost surely, 2^255404417 is an apocalyptic number.

It is an amenable number.

255404417 is a deficient number, since it is larger than the sum of its proper divisors (1).

255404417 is an equidigital number, since it uses as much as digits as its factorization.

255404417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22400, while the sum is 32.

The square root of 255404417 is about 15981.3771934712. The cubic root of 255404417 is about 634.4676274493.

Adding to 255404417 its reverse (714404552), we get a palindrome (969808969).

The spelling of 255404417 in words is "two hundred fifty-five million, four hundred four thousand, four hundred seventeen".