256522985 has 8 divisors (see below), whose sum is σ = 317757696. Its totient is φ = 198598320.

The previous prime is 256522969. The next prime is 256522997. The reversal of 256522985 is 589225652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256522985 - 2⁴ = 256522969 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, 827339 + ... + 827648.

It is an arithmetic number, because the mean of its divisors is an integer number (39719712).

Almost surely, 2^256522985 is an apocalyptic number.

It is an amenable number.

256522985 is a deficient number, since it is larger than the sum of its proper divisors (61234711).

256522985 is a wasteful number, since it uses less digits than its factorization.

256522985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655023.

The product of its digits is 432000, while the sum is 44.

The square root of 256522985 is about 16016.3349428014. The cubic root of 256522985 is about 635.3925157078.

The spelling of 256522985 in words is "two hundred fifty-six million, five hundred twenty-two thousand, nine hundred eighty-five".