256185001 has 2 divisors, whose sum is σ = 256185002. Its totient is φ = 256185000.

The previous prime is 256184993. The next prime is 256185011. The reversal of 256185001 is 100581652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244109376 + 12075625 = 15624^2 + 3475^2 .

It is a cyclic number.

It is not a de Polignac number, because 256185001 - 2³ = 256184993 is a prime.

It is not a weakly prime, because it can be changed into another prime (256185011) 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, 128092500 + 128092501.

It is an arithmetic number, because the mean of its divisors is an integer number (128092501).

Almost surely, 2^256185001 is an apocalyptic number.

It is an amenable number.

256185001 is a deficient number, since it is larger than the sum of its proper divisors (1).

256185001 is an equidigital number, since it uses as much as digits as its factorization.

256185001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 256185001 is about 16005.7802371518. The cubic root of 256185001 is about 635.1133374899.

The spelling of 256185001 in words is "two hundred fifty-six million, one hundred eighty-five thousand, one".