256969 has 4 divisors (see below), whose sum is σ = 265860. Its totient is φ = 248080.

The previous prime is 256967. The next prime is 256981. The reversal of 256969 is 969652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 211600 + 45369 = 460^2 + 213^2 .

It is a cyclic number.

It is not a de Polignac number, because 256969 - 2¹ = 256967 is a prime.

It is a super-2 number, since 2×256969² = 132066133922, which contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256967) 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, 4402 + ... + 4459.

It is an arithmetic number, because the mean of its divisors is an integer number (66465).

2²⁵⁶⁹⁶⁹ is an apocalyptic number.

256969 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

256969 is a deficient number, since it is larger than the sum of its proper divisors (8891).

256969 is an equidigital number, since it uses as much as digits as its factorization.

256969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8890.

The product of its digits is 29160, while the sum is 37.

The square root of 256969 is about 506.9210983970. The cubic root of 256969 is about 63.5760553561.

It can be divided in two parts, 256 and 969, that added together give a triangular number (1225 = T₄₉).

The spelling of 256969 in words is "two hundred fifty-six thousand, nine hundred sixty-nine".