256974221 has 16 divisors (see below), whose sum is σ = 319119360. Its totient is φ = 201936240.

The previous prime is 256974209. The next prime is 256974229. The reversal of 256974221 is 122479652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256974221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256974229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27041 + ... + 35286.

It is an arithmetic number, because the mean of its divisors is an integer number (19944960).

Almost surely, 2^256974221 is an apocalyptic number.

It is an amenable number.

256974221 is a deficient number, since it is larger than the sum of its proper divisors (62145139).

256974221 is a wasteful number, since it uses less digits than its factorization.

256974221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62384.

The product of its digits is 60480, while the sum is 38.

The square root of 256974221 is about 16030.4154967986. The cubic root of 256974221 is about 635.7648592466.

The spelling of 256974221 in words is "two hundred fifty-six million, nine hundred seventy-four thousand, two hundred twenty-one".