256205087 has 2 divisors, whose sum is σ = 256205088. Its totient is φ = 256205086.

The previous prime is 256205077. The next prime is 256205093. The reversal of 256205087 is 780502652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256205087 - 2¹² = 256200991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256205077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128102543 + 128102544.

It is an arithmetic number, because the mean of its divisors is an integer number (128102544).

Almost surely, 2^256205087 is an apocalyptic number.

256205087 is a deficient number, since it is larger than the sum of its proper divisors (1).

256205087 is an equidigital number, since it uses as much as digits as its factorization.

256205087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 256205087 is about 16006.4076856739. The cubic root of 256205087 is about 635.1299355903.

The spelling of 256205087 in words is "two hundred fifty-six million, two hundred five thousand, eighty-seven".