256814531 has 2 divisors, whose sum is σ = 256814532. Its totient is φ = 256814530.

The previous prime is 256814513. The next prime is 256814549. The reversal of 256814531 is 135418652.

Together with previous prime (256814513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (256814513) and next prime (256814549).

It is a cyclic number.

It is not a de Polignac number, because 256814531 - 2¹⁰ = 256813507 is a prime.

It is a super-2 number, since 2×256814531² = 131907406665499922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256814491 and 256814500.

It is not a weakly prime, because it can be changed into another prime (256814501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128407265 + 128407266.

It is an arithmetic number, because the mean of its divisors is an integer number (128407266).

Almost surely, 2^256814531 is an apocalyptic number.

256814531 is a deficient number, since it is larger than the sum of its proper divisors (1).

256814531 is an equidigital number, since it uses as much as digits as its factorization.

256814531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 35.

The square root of 256814531 is about 16025.4338786817. The cubic root of 256814531 is about 635.6331387348.

The spelling of 256814531 in words is "two hundred fifty-six million, eight hundred fourteen thousand, five hundred thirty-one".