256605533 has 2 divisors, whose sum is σ = 256605534. Its totient is φ = 256605532.

The previous prime is 256605527. The next prime is 256605563. The reversal of 256605533 is 335506652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198190084 + 58415449 = 14078^2 + 7643^2 .

It is a cyclic number.

It is not a de Polignac number, because 256605533 - 2¹² = 256601437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 256605493 and 256605502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256605563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128302766 + 128302767.

It is an arithmetic number, because the mean of its divisors is an integer number (128302767).

Almost surely, 2^256605533 is an apocalyptic number.

It is an amenable number.

256605533 is a deficient number, since it is larger than the sum of its proper divisors (1).

256605533 is an equidigital number, since it uses as much as digits as its factorization.

256605533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81000, while the sum is 35.

The square root of 256605533 is about 16018.9117295776. The cubic root of 256605533 is about 635.4606639302.

The spelling of 256605533 in words is "two hundred fifty-six million, six hundred five thousand, five hundred thirty-three".