256017831 has 4 divisors (see below), whose sum is σ = 341357112. Its totient is φ = 170678552.

The previous prime is 256017821. The next prime is 256017857. The reversal of 256017831 is 138710652.

256017831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-256017831 is a prime.

It is a super-2 number, since 2×256017831² = 131090259579889122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256017792 and 256017801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256017821) 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, 42669636 + ... + 42669641.

It is an arithmetic number, because the mean of its divisors is an integer number (85339278).

Almost surely, 2^256017831 is an apocalyptic number.

256017831 is a deficient number, since it is larger than the sum of its proper divisors (85339281).

256017831 is an equidigital number, since it uses as much as digits as its factorization.

256017831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85339280.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 256017831 is about 16000.5572090474. The cubic root of 256017831 is about 634.9751626055.

The spelling of 256017831 in words is "two hundred fifty-six million, seventeen thousand, eight hundred thirty-one".