256535261 has 16 divisors (see below), whose sum is σ = 277413888. Its totient is φ = 236530800.

The previous prime is 256535249. The next prime is 256535263. The reversal of 256535261 is 162535652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256535261 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 (256535263) 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 15 ways as a sum of consecutive naturals, for example, 235460 + ... + 236546.

It is an arithmetic number, because the mean of its divisors is an integer number (17338368).

Almost surely, 2^256535261 is an apocalyptic number.

It is an amenable number.

256535261 is a deficient number, since it is larger than the sum of its proper divisors (20878627).

256535261 is a wasteful number, since it uses less digits than its factorization.

256535261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472.

The product of its digits is 54000, while the sum is 35.

The square root of 256535261 is about 16016.7181719602. The cubic root of 256535261 is about 635.4026511922.

The spelling of 256535261 in words is "two hundred fifty-six million, five hundred thirty-five thousand, two hundred sixty-one".