256782089 has 2 divisors, whose sum is σ = 256782090. Its totient is φ = 256782088.

The previous prime is 256782049. The next prime is 256782121. The reversal of 256782089 is 980287652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135606025 + 121176064 = 11645^2 + 11008^2 .

It is a cyclic number.

It is not a de Polignac number, because 256782089 - 2¹² = 256777993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256782049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128391044 + 128391045.

It is an arithmetic number, because the mean of its divisors is an integer number (128391045).

Almost surely, 2^256782089 is an apocalyptic number.

It is an amenable number.

256782089 is a deficient number, since it is larger than the sum of its proper divisors (1).

256782089 is an equidigital number, since it uses as much as digits as its factorization.

256782089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 256782089 is about 16024.4216432294. The cubic root of 256782089 is about 635.6063722345.

The spelling of 256782089 in words is "two hundred fifty-six million, seven hundred eighty-two thousand, eighty-nine".