256571845 has 16 divisors (see below), whose sum is σ = 318990960. Its totient is φ = 197876224.

The previous prime is 256571807. The next prime is 256571849. The reversal of 256571845 is 548175652.

It can be written as a sum of positive squares in 8 ways, for example, as 2934369 + 253637476 = 1713^2 + 15926^2 .

It is a cyclic number.

It is not a de Polignac number, because 256571845 - 2¹³ = 256563653 is a prime.

It is a super-2 number, since 2×256571845² = 131658223293408050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256571849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158259 + ... + 159871.

It is an arithmetic number, because the mean of its divisors is an integer number (19936935).

Almost surely, 2^256571845 is an apocalyptic number.

It is an amenable number.

256571845 is a deficient number, since it is larger than the sum of its proper divisors (62419115).

256571845 is a wasteful number, since it uses less digits than its factorization.

256571845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744.

The product of its digits is 336000, while the sum is 43.

The square root of 256571845 is about 16017.8601879277. The cubic root of 256571845 is about 635.4328542730.

The spelling of 256571845 in words is "two hundred fifty-six million, five hundred seventy-one thousand, eight hundred forty-five".