256051 has 4 divisors (see below), whose sum is σ = 258552. Its totient is φ = 253552.

The previous prime is 256049. The next prime is 256057. The reversal of 256051 is 150652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256051 - 2¹ = 256049 is a prime.

It is a super-2 number, since 2×256051² = 131124229202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256057) 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, 1090 + ... + 1303.

It is an arithmetic number, because the mean of its divisors is an integer number (64638).

256051 is a Friedman number, since it can be written as 506^2+15, using all its digits and the basic arithmetic operations.

2²⁵⁶⁰⁵¹ is an apocalyptic number.

256051 is a deficient number, since it is larger than the sum of its proper divisors (2501).

256051 is a wasteful number, since it uses less digits than its factorization.

256051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 256051 is about 506.0148219173. The cubic root of 256051 is about 63.5002583328.

The spelling of 256051 in words is "two hundred fifty-six thousand, fifty-one".