256451 has 4 divisors (see below), whose sum is σ = 276192. Its totient is φ = 236712.

The previous prime is 256441. The next prime is 256469. The reversal of 256451 is 154652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256451 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256451.

It is not an unprimeable number, because it can be changed into a prime (256441) 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 3 ways as a sum of consecutive naturals, for example, 9851 + ... + 9876.

It is an arithmetic number, because the mean of its divisors is an integer number (69048).

2²⁵⁶⁴⁵¹ is an apocalyptic number.

256451 is a deficient number, since it is larger than the sum of its proper divisors (19741).

256451 is a wasteful number, since it uses less digits than its factorization.

256451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19740.

The product of its digits is 1200, while the sum is 23.

The square root of 256451 is about 506.4099130151. The cubic root of 256451 is about 63.5333075928.

It can be divided in two parts, 256 and 451, that added together give a palindrome (707).

The spelling of 256451 in words is "two hundred fifty-six thousand, four hundred fifty-one".