256133185 has 32 divisors (see below), whose sum is σ = 384198912. Its totient is φ = 159252480.

The previous prime is 256133183. The next prime is 256133197. The reversal of 256133185 is 581331652.

256133185 = T₁ + T₂ + ... + T₁₁₅₃.

256133185 is a nontrivial binomial coefficient, being equal to C(1155, 3).

It is not a de Polignac number, because 256133185 - 2¹ = 256133183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256133185.

It is not an unprimeable number, because it can be changed into a prime (256133183) by changing a digit.

It is the 1153-rd tetrahedral number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221569 + ... + 222721.

It is an arithmetic number, because the mean of its divisors is an integer number (12006216).

Almost surely, 2^256133185 is an apocalyptic number.

It is an amenable number.

256133185 is a deficient number, since it is larger than the sum of its proper divisors (128065727).

256133185 is a wasteful number, since it uses less digits than its factorization.

256133185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753.

The product of its digits is 21600, while the sum is 34.

The square root of 256133185 is about 16004.1614900625. The cubic root of 256133185 is about 635.0705152435.

The spelling of 256133185 in words is "two hundred fifty-six million, one hundred thirty-three thousand, one hundred eighty-five".