256001601 has 8 divisors (see below), whose sum is σ = 342303840. Its totient is φ = 170183552.

The previous prime is 256001597. The next prime is 256001609. The reversal of 256001601 is 106100652.

It is a happy number.

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 256001601 - 2² = 256001597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256001609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119811 + ... + 121928.

It is an arithmetic number, because the mean of its divisors is an integer number (42787980).

Almost surely, 2^256001601 is an apocalyptic number.

It is an amenable number.

256001601 is a deficient number, since it is larger than the sum of its proper divisors (86302239).

256001601 is a wasteful number, since it uses less digits than its factorization.

256001601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242095.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 256001601 is about 16000.0500311718. The cubic root of 256001601 is about 634.9617444455.

The spelling of 256001601 in words is "two hundred fifty-six million, one thousand, six hundred one".