256043573 has 2 divisors, whose sum is σ = 256043574. Its totient is φ = 256043572.

The previous prime is 256043551. The next prime is 256043587. The reversal of 256043573 is 375340652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 250177489 + 5866084 = 15817^2 + 2422^2 .

It is a cyclic number.

It is not a de Polignac number, because 256043573 - 2²⁶ = 188934709 is a prime.

It is a super-2 number, since 2×256043573² = 131116622549212658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256043533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128021786 + 128021787.

It is an arithmetic number, because the mean of its divisors is an integer number (128021787).

Almost surely, 2^256043573 is an apocalyptic number.

It is an amenable number.

256043573 is a deficient number, since it is larger than the sum of its proper divisors (1).

256043573 is an equidigital number, since it uses as much as digits as its factorization.

256043573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 35.

The square root of 256043573 is about 16001.3615983141. The cubic root of 256043573 is about 634.9964436530.

The spelling of 256043573 in words is "two hundred fifty-six million, forty-three thousand, five hundred seventy-three".