256959505 has 32 divisors (see below), whose sum is σ = 364912128. Its totient is φ = 171571200.

The previous prime is 256959503. The next prime is 256959509. The reversal of 256959505 is 505959652.

It is a happy number.

It is not a de Polignac number, because 256959505 - 2¹ = 256959503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256959503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34984 + ... + 41686.

It is an arithmetic number, because the mean of its divisors is an integer number (11403504).

Almost surely, 2^256959505 is an apocalyptic number.

It is an amenable number.

256959505 is a deficient number, since it is larger than the sum of its proper divisors (107952623).

256959505 is a wasteful number, since it uses less digits than its factorization.

256959505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6777.

The product of its (nonzero) digits is 607500, while the sum is 46.

The square root of 256959505 is about 16029.9564877763. The cubic root of 256959505 is about 635.7527230172.

The spelling of 256959505 in words is "two hundred fifty-six million, nine hundred fifty-nine thousand, five hundred five".