256144841 has 2 divisors, whose sum is σ = 256144842. Its totient is φ = 256144840.

The previous prime is 256144799. The next prime is 256144843. The reversal of 256144841 is 148441652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214915600 + 41229241 = 14660^2 + 6421^2 .

It is a cyclic number.

It is not a de Polignac number, because 256144841 - 2¹⁰ = 256143817 is a prime.

It is a super-2 number, since 2×256144841² = 131220359141830562, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 256144843, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (256144843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128072420 + 128072421.

It is an arithmetic number, because the mean of its divisors is an integer number (128072421).

Almost surely, 2^256144841 is an apocalyptic number.

It is an amenable number.

256144841 is a deficient number, since it is larger than the sum of its proper divisors (1).

256144841 is an equidigital number, since it uses as much as digits as its factorization.

256144841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30720, while the sum is 35.

The square root of 256144841 is about 16004.5256412054. The cubic root of 256144841 is about 635.0801486037.

The spelling of 256144841 in words is "two hundred fifty-six million, one hundred forty-four thousand, eight hundred forty-one".