256312305 has 12 divisors (see below), whose sum is σ = 444274740. Its totient is φ = 136699872.

The previous prime is 256312297. The next prime is 256312313. The reversal of 256312305 is 503213652.

256312305 is a `hidden beast` number, since 2 + 5 + 631 + 23 + 0 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (256312297) and next prime (256312313).

It can be written as a sum of positive squares in 2 ways, for example, as 153066384 + 103245921 = 12372^2 + 10161^2 .

It is not a de Polignac number, because 256312305 - 2³ = 256312297 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2847870 + ... + 2847959.

It is an arithmetic number, because the mean of its divisors is an integer number (37022895).

Almost surely, 2^256312305 is an apocalyptic number.

It is an amenable number.

256312305 is a deficient number, since it is larger than the sum of its proper divisors (187962435).

256312305 is a wasteful number, since it uses less digits than its factorization.

256312305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5695840 (or 5695837 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 256312305 is about 16009.7565565501. The cubic root of 256312305 is about 635.2185206963.

Adding to 256312305 its reverse (503213652), we get a palindrome (759525957).

The spelling of 256312305 in words is "two hundred fifty-six million, three hundred twelve thousand, three hundred five".