256136 has 16 divisors (see below), whose sum is σ = 486540. Its totient is φ = 126400.

The previous prime is 256133. The next prime is 256147. The reversal of 256136 is 631652.

It can be written as a sum of positive squares in 2 ways, for example, as 256036 + 100 = 506^2 + 10^2 .

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (256133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650 + ... + 966.

2²⁵⁶¹³⁶ is an apocalyptic number.

It is an amenable number.

256136 is a deficient number, since it is larger than the sum of its proper divisors (230404).

256136 is a wasteful number, since it uses less digits than its factorization.

256136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 420 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 256136 is about 506.0988045827. The cubic root of 256136 is about 63.5072841790.

Adding to 256136 its reverse (631652), we get a palindrome (887788).

The spelling of 256136 in words is "two hundred fifty-six thousand, one hundred thirty-six".