256321641 has 8 divisors (see below), whose sum is σ = 343062720. Its totient is φ = 170230832.

The previous prime is 256321619. The next prime is 256321643. The reversal of 256321641 is 146123652.

256321641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 256321641 - 2¹⁷ = 256190569 is a prime.

It is a super-3 number, since 3×256321641³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256321599 and 256321608.

It is not an unprimeable number, because it can be changed into a prime (256321643) 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, 161646 + ... + 163223.

It is an arithmetic number, because the mean of its divisors is an integer number (42882840).

Almost surely, 2^256321641 is an apocalyptic number.

It is an amenable number.

256321641 is a deficient number, since it is larger than the sum of its proper divisors (86741079).

256321641 is a wasteful number, since it uses less digits than its factorization.

256321641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325135.

The product of its digits is 8640, while the sum is 30.

The square root of 256321641 is about 16010.0481260988. The cubic root of 256321641 is about 635.2262330691.

The spelling of 256321641 in words is "two hundred fifty-six million, three hundred twenty-one thousand, six hundred forty-one".