256681841 has 8 divisors (see below), whose sum is σ = 276588480. Its totient is φ = 236798352.

The previous prime is 256681837. The next prime is 256681847. The reversal of 256681841 is 148186652.

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

It is a cyclic number.

It is not a de Polignac number, because 256681841 - 2² = 256681837 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256681847) 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, 22340 + ... + 31818.

It is an arithmetic number, because the mean of its divisors is an integer number (34573560).

Almost surely, 2^256681841 is an apocalyptic number.

It is an amenable number.

256681841 is a deficient number, since it is larger than the sum of its proper divisors (19906639).

256681841 is a wasteful number, since it uses less digits than its factorization.

256681841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11575.

The product of its digits is 92160, while the sum is 41.

The square root of 256681841 is about 16021.2933622726. The cubic root of 256681841 is about 635.5236476676.

It can be divided in two parts, 25 and 6681841, that added together give a palindrome (6681866).

The spelling of 256681841 in words is "two hundred fifty-six million, six hundred eighty-one thousand, eight hundred forty-one".