256560529 has 2 divisors, whose sum is σ = 256560530. Its totient is φ = 256560528.

The previous prime is 256560523. The next prime is 256560589. The reversal of 256560529 is 925065652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232501504 + 24059025 = 15248^2 + 4905^2 .

It is a cyclic number.

It is not a de Polignac number, because 256560529 - 2²³ = 248171921 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 256560491 and 256560500.

It is not a weakly prime, because it can be changed into another prime (256560523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128280264 + 128280265.

It is an arithmetic number, because the mean of its divisors is an integer number (128280265).

Almost surely, 2^256560529 is an apocalyptic number.

It is an amenable number.

256560529 is a deficient number, since it is larger than the sum of its proper divisors (1).

256560529 is an equidigital number, since it uses as much as digits as its factorization.

256560529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 256560529 is about 16017.5069533308. The cubic root of 256560529 is about 635.4235122972.

The spelling of 256560529 in words is "two hundred fifty-six million, five hundred sixty thousand, five hundred twenty-nine".