256940771 has 4 divisors (see below), whose sum is σ = 272054952. Its totient is φ = 241826592.

The previous prime is 256940731. The next prime is 256940777. The reversal of 256940771 is 177049652.

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 256940771 - 2¹⁴ = 256924387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256940777) 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, 7557065 + ... + 7557098.

It is an arithmetic number, because the mean of its divisors is an integer number (68013738).

Almost surely, 2^256940771 is an apocalyptic number.

256940771 is a deficient number, since it is larger than the sum of its proper divisors (15114181).

256940771 is a wasteful number, since it uses less digits than its factorization.

256940771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15114180.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 256940771 is about 16029.3721336801. The cubic root of 256940771 is about 635.7372724881.

The spelling of 256940771 in words is "two hundred fifty-six million, nine hundred forty thousand, seven hundred seventy-one".