256002217 has 2 divisors, whose sum is σ = 256002218. Its totient is φ = 256002216.

The previous prime is 256002211. The next prime is 256002233. The reversal of 256002217 is 712200652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176863401 + 79138816 = 13299^2 + 8896^2 .

It is a cyclic number.

It is not a de Polignac number, because 256002217 - 2²³ = 247613609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256002191 and 256002200.

It is not a weakly prime, because it can be changed into another prime (256002211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128001108 + 128001109.

It is an arithmetic number, because the mean of its divisors is an integer number (128001109).

Almost surely, 2^256002217 is an apocalyptic number.

It is an amenable number.

256002217 is a deficient number, since it is larger than the sum of its proper divisors (1).

256002217 is an equidigital number, since it uses as much as digits as its factorization.

256002217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 256002217 is about 16000.0692811000. The cubic root of 256002217 is about 634.9622537341.

Adding to 256002217 its reverse (712200652), we get a palindrome (968202869).

The spelling of 256002217 in words is "two hundred fifty-six million, two thousand, two hundred seventeen".