256238711 has 4 divisors (see below), whose sum is σ = 260581800. Its totient is φ = 251895624.

The previous prime is 256238707. The next prime is 256238713. The reversal of 256238711 is 117832652.

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 256238711 - 2² = 256238707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256238713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2171456 + ... + 2171573.

It is an arithmetic number, because the mean of its divisors is an integer number (65145450).

Almost surely, 2^256238711 is an apocalyptic number.

256238711 is a deficient number, since it is larger than the sum of its proper divisors (4343089).

256238711 is an equidigital number, since it uses as much as digits as its factorization.

256238711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4343088.

The product of its digits is 20160, while the sum is 35.

The square root of 256238711 is about 16007.4579805789. The cubic root of 256238711 is about 635.1577188986.

The spelling of 256238711 in words is "two hundred fifty-six million, two hundred thirty-eight thousand, seven hundred eleven".