256968511 has 2 divisors, whose sum is σ = 256968512. Its totient is φ = 256968510.

The previous prime is 256968497. The next prime is 256968527. The reversal of 256968511 is 115869652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256968511 - 2¹⁷ = 256837439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256968611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128484255 + 128484256.

It is an arithmetic number, because the mean of its divisors is an integer number (128484256).

Almost surely, 2^256968511 is an apocalyptic number.

256968511 is a deficient number, since it is larger than the sum of its proper divisors (1).

256968511 is an equidigital number, since it uses as much as digits as its factorization.

256968511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 43.

The square root of 256968511 is about 16030.2373968697. The cubic root of 256968511 is about 635.7601502863.

The spelling of 256968511 in words is "two hundred fifty-six million, nine hundred sixty-eight thousand, five hundred eleven".