256530161 has 8 divisors (see below), whose sum is σ = 258046944. Its totient is φ = 255018240.

The previous prime is 256530137. The next prime is 256530163. The reversal of 256530161 is 161035652.

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 256530161 - 2⁶ = 256530097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256530163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162506 + ... + 164076.

It is an arithmetic number, because the mean of its divisors is an integer number (32255868).

Almost surely, 2^256530161 is an apocalyptic number.

It is an amenable number.

256530161 is a deficient number, since it is larger than the sum of its proper divisors (1516783).

256530161 is a wasteful number, since it uses less digits than its factorization.

256530161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 256530161 is about 16016.5589625238. The cubic root of 256530161 is about 635.3984404975.

The spelling of 256530161 in words is "two hundred fifty-six million, five hundred thirty thousand, one hundred sixty-one".