256289161 has 8 divisors (see below), whose sum is σ = 283163904. Its totient is φ = 230725440.

The previous prime is 256289123. The next prime is 256289171. The reversal of 256289161 is 161982652.

256289161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 256289161 - 2¹¹ = 256287113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256289101) 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, 327345 + ... + 328126.

It is an arithmetic number, because the mean of its divisors is an integer number (35395488).

Almost surely, 2^256289161 is an apocalyptic number.

It is an amenable number.

256289161 is a deficient number, since it is larger than the sum of its proper divisors (26874743).

256289161 is a wasteful number, since it uses less digits than its factorization.

256289161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655511.

The product of its digits is 51840, while the sum is 40.

The square root of 256289161 is about 16009.0337309908. The cubic root of 256289161 is about 635.1994008704.

The spelling of 256289161 in words is "two hundred fifty-six million, two hundred eighty-nine thousand, one hundred sixty-one".