256641343 has 8 divisors (see below), whose sum is σ = 302766080. Its totient is φ = 212882040.

The previous prime is 256641323. The next prime is 256641347. The reversal of 256641343 is 343146652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256641343 - 2⁵ = 256641311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256641299 and 256641308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256641347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591123 + ... + 591556.

It is an arithmetic number, because the mean of its divisors is an integer number (37845760).

Almost surely, 2^256641343 is an apocalyptic number.

256641343 is a deficient number, since it is larger than the sum of its proper divisors (46124737).

256641343 is a wasteful number, since it uses less digits than its factorization.

256641343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182717.

The product of its digits is 51840, while the sum is 34.

The square root of 256641343 is about 16020.0294319330. The cubic root of 256641343 is about 635.4902226432.

Adding to 256641343 its reverse (343146652), we get a palindrome (599787995).

The spelling of 256641343 in words is "two hundred fifty-six million, six hundred forty-one thousand, three hundred forty-three".