1001385256 has 8 divisors (see below), whose sum is σ = 1877597370. Its totient is φ = 500692624.

The previous prime is 1001385251. The next prime is 1001385317. The reversal of 1001385256 is 6525831001.

It can be written as a sum of positive squares in only one way, i.e., 996412356 + 4972900 = 31566^2 + 2230^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1001385251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62586571 + ... + 62586586.

Almost surely, 2^1001385256 is an apocalyptic number.

It is an amenable number.

1001385256 is a deficient number, since it is larger than the sum of its proper divisors (876212114).

1001385256 is a wasteful number, since it uses less digits than its factorization.

1001385256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125173163 (or 125173159 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1001385256 is about 31644.6718421917. The cubic root of 1001385256 is about 1000.4615389490.

The spelling of 1001385256 in words is "one billion, one million, three hundred eighty-five thousand, two hundred fifty-six".