256242145 has 8 divisors (see below), whose sum is σ = 308474856. Its totient is φ = 204337536.

The previous prime is 256242083. The next prime is 256242163. The reversal of 256242145 is 541242652.

It can be written as a sum of positive squares in 4 ways, for example, as 8242641 + 247999504 = 2871^2 + 15748^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256242145 - 2¹⁵ = 256209377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80302 + ... + 83431.

It is an arithmetic number, because the mean of its divisors is an integer number (38559357).

Almost surely, 2^256242145 is an apocalyptic number.

It is an amenable number.

256242145 is a deficient number, since it is larger than the sum of its proper divisors (52232711).

256242145 is a wasteful number, since it uses less digits than its factorization.

256242145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164051.

The product of its digits is 19200, while the sum is 31.

The square root of 256242145 is about 16007.5652427220. The cubic root of 256242145 is about 635.1605562553.

Adding to 256242145 its reverse (541242652), we get a palindrome (797484797).

The spelling of 256242145 in words is "two hundred fifty-six million, two hundred forty-two thousand, one hundred forty-five".