256049641 has 2 divisors, whose sum is σ = 256049642. Its totient is φ = 256049640.

The previous prime is 256049581. The next prime is 256049669. The reversal of 256049641 is 146940652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194881600 + 61168041 = 13960^2 + 7821^2 .

It is a cyclic number.

It is not a de Polignac number, because 256049641 - 2¹¹ = 256047593 is a prime.

It is a super-2 number, since 2×256049641² = 131122837312457762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256049641.

It is not a weakly prime, because it can be changed into another prime (256049741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128024820 + 128024821.

It is an arithmetic number, because the mean of its divisors is an integer number (128024821).

Almost surely, 2^256049641 is an apocalyptic number.

It is an amenable number.

256049641 is a deficient number, since it is larger than the sum of its proper divisors (1).

256049641 is an equidigital number, since it uses as much as digits as its factorization.

256049641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 256049641 is about 16001.5512060550. The cubic root of 256049641 is about 635.0014598929.

It can be divided in two parts, 25604 and 9641, that added together give a triangular number (35245 = T₂₆₅).

The spelling of 256049641 in words is "two hundred fifty-six million, forty-nine thousand, six hundred forty-one".