255521417 has 2 divisors, whose sum is σ = 255521418. Its totient is φ = 255521416.

The previous prime is 255521401. The next prime is 255521419. The reversal of 255521417 is 714125552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230310976 + 25210441 = 15176^2 + 5021^2 .

It is a cyclic number.

It is not a de Polignac number, because 255521417 - 2⁴ = 255521401 is a prime.

Together with 255521419, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255521419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127760708 + 127760709.

It is an arithmetic number, because the mean of its divisors is an integer number (127760709).

Almost surely, 2^255521417 is an apocalyptic number.

It is an amenable number.

255521417 is a deficient number, since it is larger than the sum of its proper divisors (1).

255521417 is an equidigital number, since it uses as much as digits as its factorization.

255521417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14000, while the sum is 32.

The square root of 255521417 is about 15985.0372849112. The cubic root of 255521417 is about 634.5644952338.

Adding to 255521417 its reverse (714125552), we get a palindrome (969646969).

The spelling of 255521417 in words is "two hundred fifty-five million, five hundred twenty-one thousand, four hundred seventeen".