256217061 has 16 divisors (see below), whose sum is σ = 350034048. Its totient is φ = 166656000.

The previous prime is 256217053. The next prime is 256217083. The reversal of 256217061 is 160712652.

It is not a de Polignac number, because 256217061 - 2³ = 256217053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256217021) 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, 14461 + ... + 26861.

It is an arithmetic number, because the mean of its divisors is an integer number (21877128).

Almost surely, 2^256217061 is an apocalyptic number.

It is an amenable number.

256217061 is a deficient number, since it is larger than the sum of its proper divisors (93816987).

256217061 is a wasteful number, since it uses less digits than its factorization.

256217061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12572.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 256217061 is about 16006.7817190090. The cubic root of 256217061 is about 635.1398299129.

The spelling of 256217061 in words is "two hundred fifty-six million, two hundred seventeen thousand, sixty-one".