256530145 has 8 divisors (see below), whose sum is σ = 308084904. Its totient is φ = 205058304.

The previous prime is 256530137. The next prime is 256530163. The reversal of 256530145 is 541035652.

It can be written as a sum of positive squares in 4 ways, for example, as 99980001 + 156550144 = 9999^2 + 12512^2 .

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 256530145 - 2³ = 256530137 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, 13704 + ... + 26473.

It is an arithmetic number, because the mean of its divisors is an integer number (38510613).

Almost surely, 2^256530145 is an apocalyptic number.

It is an amenable number.

256530145 is a deficient number, since it is larger than the sum of its proper divisors (51554759).

256530145 is a wasteful number, since it uses less digits than its factorization.

256530145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41459.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 256530145 is about 16016.5584630407. The cubic root of 256530145 is about 635.3984272874.

Adding to 256530145 its reverse (541035652), we get a palindrome (797565797).

The spelling of 256530145 in words is "two hundred fifty-six million, five hundred thirty thousand, one hundred forty-five".