1005681 has 8 divisors (see below), whose sum is σ = 1346944. Its totient is φ = 667440.

The previous prime is 1005679. The next prime is 1005701. The reversal of 1005681 is 1865001.

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

It is not a de Polignac number, because 1005681 - 2¹ = 1005679 is a prime.

It is a super-2 number, since 2×1005681² = 2022788547522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195 + ... + 1431.

It is an arithmetic number, because the mean of its divisors is an integer number (168368).

2^1005681 is an apocalyptic number.

It is an amenable number.

1005681 is a deficient number, since it is larger than the sum of its proper divisors (341263).

1005681 is a wasteful number, since it uses less digits than its factorization.

1005681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1005681 is about 1002.8364771986. The cubic root of 1005681 is about 100.1890091968.

The spelling of 1005681 in words is "one million, five thousand, six hundred eighty-one".