256951 has 4 divisors (see below), whose sum is σ = 258192. Its totient is φ = 255712.

The previous prime is 256939. The next prime is 256957. The reversal of 256951 is 159652.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256951 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226 + ... + 751.

It is an arithmetic number, because the mean of its divisors is an integer number (64548).

2²⁵⁶⁹⁵¹ is an apocalyptic number.

256951 is a deficient number, since it is larger than the sum of its proper divisors (1241).

256951 is an equidigital number, since it uses as much as digits as its factorization.

256951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240.

The product of its digits is 2700, while the sum is 28.

The square root of 256951 is about 506.9033438438. The cubic root of 256951 is about 63.5745708765.

It can be divided in two parts, 2 and 56951, that added together give a triangular number (56953 = T₃₃₇).

The spelling of 256951 in words is "two hundred fifty-six thousand, nine hundred fifty-one".