255717251 has 2 divisors, whose sum is σ = 255717252. Its totient is φ = 255717250.

The previous prime is 255717223. The next prime is 255717283. The reversal of 255717251 is 152717552.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255717251 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255777251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127858625 + 127858626.

It is an arithmetic number, because the mean of its divisors is an integer number (127858626).

Almost surely, 2^255717251 is an apocalyptic number.

255717251 is a deficient number, since it is larger than the sum of its proper divisors (1).

255717251 is an equidigital number, since it uses as much as digits as its factorization.

255717251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24500, while the sum is 35.

The square root of 255717251 is about 15991.1616526130. The cubic root of 255717251 is about 634.7265658882.

The spelling of 255717251 in words is "two hundred fifty-five million, seven hundred seventeen thousand, two hundred fifty-one".