256248287 has 2 divisors, whose sum is σ = 256248288. Its totient is φ = 256248286.

The previous prime is 256248283. The next prime is 256248299. The reversal of 256248287 is 782842652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256248287 - 2² = 256248283 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256248283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128124143 + 128124144.

It is an arithmetic number, because the mean of its divisors is an integer number (128124144).

Almost surely, 2^256248287 is an apocalyptic number.

256248287 is a deficient number, since it is larger than the sum of its proper divisors (1).

256248287 is an equidigital number, since it uses as much as digits as its factorization.

256248287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 430080, while the sum is 44.

The square root of 256248287 is about 16007.7570883619. The cubic root of 256248287 is about 635.1656310450.

The spelling of 256248287 in words is "two hundred fifty-six million, two hundred forty-eight thousand, two hundred eighty-seven".