1000681 has 4 divisors (see below), whose sum is σ = 1091664. Its totient is φ = 909700.

The previous prime is 1000679. The next prime is 1000691. The reversal of 1000681 is 1860001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1000681 - 2¹ = 1000679 is a prime.

It is a super-2 number, since 2×1000681² = 2002724927522, which contains 22 as substring.

It is a Duffinian number.

1000681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1000621) 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 3 ways as a sum of consecutive naturals, for example, 45475 + ... + 45496.

It is an arithmetic number, because the mean of its divisors is an integer number (272916).

2^1000681 is an apocalyptic number.

1000681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1000681 is a deficient number, since it is larger than the sum of its proper divisors (90983).

1000681 is an equidigital number, since it uses as much as digits as its factorization.

1000681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90982.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1000681 is about 1000.3404420496. The cubic root of 1000681 is about 100.0226948490.

Adding to 1000681 its reverse (1860001), we get a palindrome (2860682).

It can be divided in two parts, 1000 and 681, that added together give a square (1681 = 41²).

The spelling of 1000681 in words is "one million, six hundred eighty-one", and thus it is an aban number.