256241549 has 2 divisors, whose sum is σ = 256241550. Its totient is φ = 256241548.

The previous prime is 256241497. The next prime is 256241569. The reversal of 256241549 is 945142652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177156100 + 79085449 = 13310^2 + 8893^2 .

It is a cyclic number.

It is not a de Polignac number, because 256241549 - 2¹² = 256237453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256241569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128120774 + 128120775.

It is an arithmetic number, because the mean of its divisors is an integer number (128120775).

Almost surely, 2^256241549 is an apocalyptic number.

It is an amenable number.

256241549 is a deficient number, since it is larger than the sum of its proper divisors (1).

256241549 is an equidigital number, since it uses as much as digits as its factorization.

256241549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 38.

The square root of 256241549 is about 16007.5466265134. The cubic root of 256241549 is about 635.1600638097.

The spelling of 256241549 in words is "two hundred fifty-six million, two hundred forty-one thousand, five hundred forty-nine".