1000881 has 12 divisors (see below), whose sum is σ = 1652352. Its totient is φ = 571896.

The previous prime is 1000861. The next prime is 1000889. The reversal of 1000881 is 1880001.

It is a happy number.

It is not a de Polignac number, because 1000881 - 2⁵ = 1000849 is a prime.

It is a super-2 number, since 2×1000881² = 2003525552322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1000889) 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 11 ways as a sum of consecutive naturals, for example, 7881 + ... + 8006.

It is an arithmetic number, because the mean of its divisors is an integer number (137696).

2^1000881 is an apocalyptic number.

It is an amenable number.

1000881 is a deficient number, since it is larger than the sum of its proper divisors (651471).

1000881 is a wasteful number, since it uses less digits than its factorization.

1000881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15900 (or 15897 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 1000881 is about 1000.4404030226. The cubic root of 1000881 is about 100.0293580469.

Adding to 1000881 its reverse (1880001), we get a palindrome (2880882).

It can be divided in two parts, 1000 and 881, that added together give a palindrome (1881).

The spelling of 1000881 in words is "one million, eight hundred eighty-one", and thus it is an aban number.