256931135 has 8 divisors (see below), whose sum is σ = 313543440. Its totient is φ = 202060864.

The previous prime is 256931117. The next prime is 256931153. The reversal of 256931135 is 531139652.

It is an interprime number because it is at equal distance from previous prime (256931117) and next prime (256931153).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256931135 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256931095 and 256931104.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 435182 + ... + 435771.

It is an arithmetic number, because the mean of its divisors is an integer number (39192930).

Almost surely, 2^256931135 is an apocalyptic number.

256931135 is a deficient number, since it is larger than the sum of its proper divisors (56612305).

256931135 is an equidigital number, since it uses as much as digits as its factorization.

256931135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871017.

The product of its digits is 24300, while the sum is 35.

The square root of 256931135 is about 16029.0715576418. The cubic root of 256931135 is about 635.7293250781.

The spelling of 256931135 in words is "two hundred fifty-six million, nine hundred thirty-one thousand, one hundred thirty-five".