256897379 has 2 divisors, whose sum is σ = 256897380. Its totient is φ = 256897378.

The previous prime is 256897337. The next prime is 256897391. The reversal of 256897379 is 973798652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256897379 - 2¹² = 256893283 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (256897079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128448689 + 128448690.

It is an arithmetic number, because the mean of its divisors is an integer number (128448690).

Almost surely, 2^256897379 is an apocalyptic number.

256897379 is a deficient number, since it is larger than the sum of its proper divisors (1).

256897379 is an equidigital number, since it uses as much as digits as its factorization.

256897379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 56.

The square root of 256897379 is about 16028.0185612570. The cubic root of 256897379 is about 635.7014828329.

The spelling of 256897379 in words is "two hundred fifty-six million, eight hundred ninety-seven thousand, three hundred seventy-nine".