256981558 has 8 divisors (see below), whose sum is σ = 386332200. Its totient is φ = 128204160.

The previous prime is 256981519. The next prime is 256981559. The reversal of 256981558 is 855189652.

256981558 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256981559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142188 + ... + 143983.

It is an arithmetic number, because the mean of its divisors is an integer number (48291525).

Almost surely, 2^256981558 is an apocalyptic number.

256981558 is a deficient number, since it is larger than the sum of its proper divisors (129350642).

256981558 is a wasteful number, since it uses less digits than its factorization.

256981558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286622.

The product of its digits is 864000, while the sum is 49.

The square root of 256981558 is about 16030.6443413857. The cubic root of 256981558 is about 635.7709098696.

The spelling of 256981558 in words is "two hundred fifty-six million, nine hundred eighty-one thousand, five hundred fifty-eight".