256843253 has 2 divisors, whose sum is σ = 256843254. Its totient is φ = 256843252.

The previous prime is 256843241. The next prime is 256843271. The reversal of 256843253 is 352348652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141538609 + 115304644 = 11897^2 + 10738^2 .

It is a cyclic number.

It is not a de Polignac number, because 256843253 - 2⁶ = 256843189 is a prime.

It is a super-2 number, since 2×256843253² = 131936913223244018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256849253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128421626 + 128421627.

It is an arithmetic number, because the mean of its divisors is an integer number (128421627).

Almost surely, 2^256843253 is an apocalyptic number.

It is an amenable number.

256843253 is a deficient number, since it is larger than the sum of its proper divisors (1).

256843253 is an equidigital number, since it uses as much as digits as its factorization.

256843253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 38.

The square root of 256843253 is about 16026.3299916107. The cubic root of 256843253 is about 635.6568341417.

The spelling of 256843253 in words is "two hundred fifty-six million, eight hundred forty-three thousand, two hundred fifty-three".