256185361 has 2 divisors, whose sum is σ = 256185362. Its totient is φ = 256185360.

The previous prime is 256185331. The next prime is 256185367. The reversal of 256185361 is 163581652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147379600 + 108805761 = 12140^2 + 10431^2 .

It is a cyclic number.

It is not a de Polignac number, because 256185361 - 2⁵ = 256185329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256185361.

It is not a weakly prime, because it can be changed into another prime (256185367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128092680 + 128092681.

It is an arithmetic number, because the mean of its divisors is an integer number (128092681).

Almost surely, 2^256185361 is an apocalyptic number.

It is an amenable number.

256185361 is a deficient number, since it is larger than the sum of its proper divisors (1).

256185361 is an equidigital number, since it uses as much as digits as its factorization.

256185361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 37.

The square root of 256185361 is about 16005.7914830851. The cubic root of 256185361 is about 635.1136349841.

The spelling of 256185361 in words is "two hundred fifty-six million, one hundred eighty-five thousand, three hundred sixty-one".