256147 has 2 divisors, whose sum is σ = 256148. Its totient is φ = 256146.

The previous prime is 256133. The next prime is 256163. The reversal of 256147 is 741652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256147 - 2⁷ = 256019 is a prime.

It is a super-2 number, since 2×256147² = 131222571218, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

256147 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (256117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128073 + 128074.

It is an arithmetic number, because the mean of its divisors is an integer number (128074).

2²⁵⁶¹⁴⁷ is an apocalyptic number.

256147 is a deficient number, since it is larger than the sum of its proper divisors (1).

256147 is an equidigital number, since it uses as much as digits as its factorization.

256147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 25.

The square root of 256147 is about 506.1096719092. The cubic root of 256147 is about 63.5081932925.

Adding to 256147 its reverse (741652), we get a palindrome (997799).

The spelling of 256147 in words is "two hundred fifty-six thousand, one hundred forty-seven".