256612241 has 2 divisors, whose sum is σ = 256612242. Its totient is φ = 256612240.

The previous prime is 256612217. The next prime is 256612249. The reversal of 256612241 is 142216652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208947025 + 47665216 = 14455^2 + 6904^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256612241 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (256612249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128306120 + 128306121.

It is an arithmetic number, because the mean of its divisors is an integer number (128306121).

Almost surely, 2^256612241 is an apocalyptic number.

It is an amenable number.

256612241 is a deficient number, since it is larger than the sum of its proper divisors (1).

256612241 is an equidigital number, since it uses as much as digits as its factorization.

256612241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The square root of 256612241 is about 16019.1211057286. The cubic root of 256612241 is about 635.4662011361.

Adding to 256612241 its reverse (142216652), we get a palindrome (398828893).

The spelling of 256612241 in words is "two hundred fifty-six million, six hundred twelve thousand, two hundred forty-one".