256735529 has 2 divisors, whose sum is σ = 256735530. Its totient is φ = 256735528.

The previous prime is 256735471. The next prime is 256735559. The reversal of 256735529 is 925537652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211644304 + 45091225 = 14548^2 + 6715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256735529 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256735529.

It is not a weakly prime, because it can be changed into another prime (256735559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128367764 + 128367765.

It is an arithmetic number, because the mean of its divisors is an integer number (128367765).

Almost surely, 2^256735529 is an apocalyptic number.

It is an amenable number.

256735529 is a deficient number, since it is larger than the sum of its proper divisors (1).

256735529 is an equidigital number, since it uses as much as digits as its factorization.

256735529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 567000, while the sum is 44.

The square root of 256735529 is about 16022.9687948270. The cubic root of 256735529 is about 635.5679536391.

The spelling of 256735529 in words is "two hundred fifty-six million, seven hundred thirty-five thousand, five hundred twenty-nine".