256069769 has 2 divisors, whose sum is σ = 256069770. Its totient is φ = 256069768.

The previous prime is 256069763. The next prime is 256069789. The reversal of 256069769 is 967960652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220225600 + 35844169 = 14840^2 + 5987^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256069769 is a prime.

It is a super-2 number, since 2×256069769² = 131143453191426722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256069763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128034884 + 128034885.

It is an arithmetic number, because the mean of its divisors is an integer number (128034885).

Almost surely, 2^256069769 is an apocalyptic number.

It is an amenable number.

256069769 is a deficient number, since it is larger than the sum of its proper divisors (1).

256069769 is an equidigital number, since it uses as much as digits as its factorization.

256069769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The square root of 256069769 is about 16002.1801327194. The cubic root of 256069769 is about 635.0180985604.

The spelling of 256069769 in words is "two hundred fifty-six million, sixty-nine thousand, seven hundred sixty-nine".