256178849 has 2 divisors, whose sum is σ = 256178850. Its totient is φ = 256178848.

The previous prime is 256178809. The next prime is 256178911. The reversal of 256178849 is 948871652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249418849 + 6760000 = 15793^2 + 2600^2 .

It is a cyclic number.

It is not a de Polignac number, because 256178849 - 2¹² = 256174753 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 256178797 and 256178806.

It is not a weakly prime, because it can be changed into another prime (256178809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128089424 + 128089425.

It is an arithmetic number, because the mean of its divisors is an integer number (128089425).

Almost surely, 2^256178849 is an apocalyptic number.

It is an amenable number.

256178849 is a deficient number, since it is larger than the sum of its proper divisors (1).

256178849 is an equidigital number, since it uses as much as digits as its factorization.

256178849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 50.

The square root of 256178849 is about 16005.5880554261. The cubic root of 256178849 is about 635.1082536006.

The spelling of 256178849 in words is "two hundred fifty-six million, one hundred seventy-eight thousand, eight hundred forty-nine".