256973 has 4 divisors (see below), whose sum is σ = 258108. Its totient is φ = 255840.

The previous prime is 256967. The next prime is 256981. The reversal of 256973 is 379652.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 24649 + 232324 = 157^2 + 482^2 .

It is a cyclic number.

It is not a de Polignac number, because 256973 - 2⁴ = 256957 is a prime.

It is a Duffinian number.

256973 is a Rhonda number in base 10.

Its product of digits (11340) is a multiple of the sum of its prime divisors (1134).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256973.

It is not an unprimeable number, because it can be changed into a prime (256903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98 + ... + 723.

It is an arithmetic number, because the mean of its divisors is an integer number (64527).

2²⁵⁶⁹⁷³ is an apocalyptic number.

It is an amenable number.

256973 is a deficient number, since it is larger than the sum of its proper divisors (1135).

256973 is an equidigital number, since it uses as much as digits as its factorization.

256973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134.

The product of its digits is 11340, while the sum is 32.

The square root of 256973 is about 506.9250437688. The cubic root of 256973 is about 63.5763852310.

The spelling of 256973 in words is "two hundred fifty-six thousand, nine hundred seventy-three".