256611 has 8 divisors (see below), whose sum is σ = 357120.
Its totient is φ = 163592.
The previous prime is 256609. The next prime is 256639. The reversal of 256611 is 116652.
256611 = 512 + 522 + ... + 962.
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 256611 - 21 = 256609 is a prime.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256611.
It is not an unprimeable number, because it can be changed into a prime (256651) 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, 1791 + ... + 1928.
It is an arithmetic number, because the mean of its divisors is an integer number (44640).
2256611 is an apocalyptic number.
256611 is a deficient number, since it is larger than the sum of its proper divisors (100509).
256611 is a wasteful number, since it uses less digits than its factorization.
256611 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3745.
The product of its digits is 360, while the sum is 21.
The square root of 256611 is about 506.5678631733.
The cubic root of 256611 is about 63.5465176744.
The spelling of 256611 in words is "two hundred fifty-six thousand, six hundred eleven".