256939349 has 2 divisors, whose sum is σ = 256939350. Its totient is φ = 256939348.

The previous prime is 256939327. The next prime is 256939369. The reversal of 256939349 is 943939652.

256939349 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230827249 + 26112100 = 15193^2 + 5110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256939349 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 256939297 and 256939306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256939369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128469674 + 128469675.

It is an arithmetic number, because the mean of its divisors is an integer number (128469675).

Almost surely, 2^256939349 is an apocalyptic number.

It is an amenable number.

256939349 is a deficient number, since it is larger than the sum of its proper divisors (1).

256939349 is an equidigital number, since it uses as much as digits as its factorization.

256939349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 50.

The square root of 256939349 is about 16029.3277775458. The cubic root of 256939349 is about 635.7360996885.

The spelling of 256939349 in words is "two hundred fifty-six million, nine hundred thirty-nine thousand, three hundred forty-nine".