256523853 has 32 divisors (see below), whose sum is σ = 377118720. Its totient is φ = 154566720.

The previous prime is 256523851. The next prime is 256523893. The reversal of 256523853 is 358325652.

It is not a de Polignac number, because 256523853 - 2¹ = 256523851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256523851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90583 + ... + 93371.

It is an arithmetic number, because the mean of its divisors is an integer number (11784960).

Almost surely, 2^256523853 is an apocalyptic number.

256523853 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

256523853 is a deficient number, since it is larger than the sum of its proper divisors (120594867).

256523853 is a wasteful number, since it uses less digits than its factorization.

256523853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889.

The product of its digits is 216000, while the sum is 39.

The square root of 256523853 is about 16016.3620401139. The cubic root of 256523853 is about 635.3932323689.

The spelling of 256523853 in words is "two hundred fifty-six million, five hundred twenty-three thousand, eight hundred fifty-three".