256180873 has 4 divisors (see below), whose sum is σ = 275887108. Its totient is φ = 236474640.

The previous prime is 256180829. The next prime is 256180921. The reversal of 256180873 is 378081652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 138956944 + 117223929 = 11788^2 + 10827^2 .

It is a cyclic number.

It is not a de Polignac number, because 256180873 - 2²¹ = 254083721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256180823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9853098 + ... + 9853123.

It is an arithmetic number, because the mean of its divisors is an integer number (68971777).

Almost surely, 2^256180873 is an apocalyptic number.

It is an amenable number.

256180873 is a deficient number, since it is larger than the sum of its proper divisors (19706235).

256180873 is a wasteful number, since it uses less digits than its factorization.

256180873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19706234.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 256180873 is about 16005.6512832187. The cubic root of 256180873 is about 635.1099262026.

The spelling of 256180873 in words is "two hundred fifty-six million, one hundred eighty thousand, eight hundred seventy-three".