256543311 has 48 divisors (see below), whose sum is σ = 390356064. Its totient is φ = 149225472.

The previous prime is 256543303. The next prime is 256543319. The reversal of 256543311 is 113345652.

256543311 is nontrivially palindromic in base 16.

It is an interprime number because it is at equal distance from previous prime (256543303) and next prime (256543319).

It is not a de Polignac number, because 256543311 - 2³ = 256543303 is a prime.

Its product of digits (10800) is a multiple of the sum of its prime factors (360).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256543319) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 998095 + ... + 998351.

It is an arithmetic number, because the mean of its divisors is an integer number (8132418).

Almost surely, 2^256543311 is an apocalyptic number.

256543311 is a deficient number, since it is larger than the sum of its proper divisors (133812753).

256543311 is a wasteful number, since it uses less digits than its factorization.

256543311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 337 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 256543311 is about 16016.9694699091. The cubic root of 256543311 is about 635.4092973713.

Adding to 256543311 its reverse (113345652), we get a palindrome (369888963).

The spelling of 256543311 in words is "two hundred fifty-six million, five hundred forty-three thousand, three hundred eleven".