256535749 has 2 divisors, whose sum is σ = 256535750. Its totient is φ = 256535748.

The previous prime is 256535743. The next prime is 256535761. The reversal of 256535749 is 947535652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224250625 + 32285124 = 14975^2 + 5682^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256535749 is a prime.

It is a super-4 number, since 4×256535749⁴ (a number of 35 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256535699 and 256535708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256535743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128267874 + 128267875.

It is an arithmetic number, because the mean of its divisors is an integer number (128267875).

Almost surely, 2^256535749 is an apocalyptic number.

It is an amenable number.

256535749 is a deficient number, since it is larger than the sum of its proper divisors (1).

256535749 is an equidigital number, since it uses as much as digits as its factorization.

256535749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134000, while the sum is 46.

The square root of 256535749 is about 16016.7334060351. The cubic root of 256535749 is about 635.4030540950.

The spelling of 256535749 in words is "two hundred fifty-six million, five hundred thirty-five thousand, seven hundred forty-nine".