256105145 has 16 divisors (see below), whose sum is σ = 314176320. Its totient is φ = 200356800.

The previous prime is 256105141. The next prime is 256105163. The reversal of 256105145 is 541501652.

It is a happy number.

It is not a de Polignac number, because 256105145 - 2² = 256105141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256105141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52250 + ... + 56940.

It is an arithmetic number, because the mean of its divisors is an integer number (19636020).

Almost surely, 2^256105145 is an apocalyptic number.

It is an amenable number.

256105145 is a deficient number, since it is larger than the sum of its proper divisors (58071175).

256105145 is a wasteful number, since it uses less digits than its factorization.

256105145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4936.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 256105145 is about 16003.2854439331. The cubic root of 256105145 is about 635.0473397654.

Adding to 256105145 its reverse (541501652), we get a palindrome (797606797).

The spelling of 256105145 in words is "two hundred fifty-six million, one hundred five thousand, one hundred forty-five".