256911469 has 2 divisors, whose sum is σ = 256911470. Its totient is φ = 256911468.

The previous prime is 256911467. The next prime is 256911481. The reversal of 256911469 is 964119652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250810569 + 6100900 = 15837^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 256911469 - 2¹ = 256911467 is a prime.

It is a super-2 number, since 2×256911469² = 132007005807475922, which contains 22 as substring.

Together with 256911467, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256911467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128455734 + 128455735.

It is an arithmetic number, because the mean of its divisors is an integer number (128455735).

Almost surely, 2^256911469 is an apocalyptic number.

It is an amenable number.

256911469 is a deficient number, since it is larger than the sum of its proper divisors (1).

256911469 is an equidigital number, since it uses as much as digits as its factorization.

256911469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 256911469 is about 16028.4580980205. The cubic root of 256911469 is about 635.7131046852.

The spelling of 256911469 in words is "two hundred fifty-six million, nine hundred eleven thousand, four hundred sixty-nine".